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61621 = 78803
BaseRepresentation
bin1111000010110101
310010112021
433002311
53432441
61153141
7344440
oct170265
9103467
1061621
114232a
122b7b1
1322081
1418657
15133d1
hexf0b5

61621 has 4 divisors (see below), whose sum is σ = 70432. Its totient is φ = 52812.

The previous prime is 61613. The next prime is 61627. The reversal of 61621 is 12616.

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.

It is a cyclic number.

It is not a de Polignac number, because 61621 - 23 = 61613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61595 and 61604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61627) 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, 4395 + ... + 4408.

It is an arithmetic number, because the mean of its divisors is an integer number (17608).

261621 is an apocalyptic number.

It is an amenable number.

61621 is a deficient number, since it is larger than the sum of its proper divisors (8811).

61621 is an equidigital number, since it uses as much as digits as its factorization.

61621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8810.

The product of its digits is 72, while the sum is 16.

The square root of 61621 is about 248.2357750204. The cubic root of 61621 is about 39.4981038453.

The spelling of 61621 in words is "sixty-one thousand, six hundred twenty-one".

Divisors: 1 7 8803 61621