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91421 = 118311
BaseRepresentation
bin10110010100011101
311122101222
4112110131
510411141
61543125
7530351
oct262435
9148358
1091421
1162760
1244aa5
13327c5
1425461
151c14b
hex1651d

91421 has 4 divisors (see below), whose sum is σ = 99744. Its totient is φ = 83100.

The previous prime is 91411. The next prime is 91423. The reversal of 91421 is 12419.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12419 = 111129.

It is a cyclic number.

It is not a de Polignac number, because 91421 - 210 = 90397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91421.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91421.

It is not an unprimeable number, because it can be changed into a prime (91423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4145 + ... + 4166.

It is an arithmetic number, because the mean of its divisors is an integer number (24936).

291421 is an apocalyptic number.

It is an amenable number.

91421 is a deficient number, since it is larger than the sum of its proper divisors (8323).

91421 is a wasteful number, since it uses less digits than its factorization.

91421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8322.

The product of its digits is 72, while the sum is 17.

The square root of 91421 is about 302.3590580750. The cubic root of 91421 is about 45.0486716180.

It can be divided in two parts, 91 and 421, that added together give a 9-th power (512 = 29).

The spelling of 91421 in words is "ninety-one thousand, four hundred twenty-one".

Divisors: 1 11 8311 91421