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91281431 is a prime number
BaseRepresentation
bin1010111000011…
…01100000010111
320100202120120202
411130031200113
5141332001211
613020251115
72155610423
oct534154027
9210676522
1091281431
11475870aa
12266a0a9b
1315bb02a7
14c1a1b83
15803153b
hex570d817

91281431 has 2 divisors, whose sum is σ = 91281432. Its totient is φ = 91281430.

The previous prime is 91281409. The next prime is 91281433. The reversal of 91281431 is 13418219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91281431 - 214 = 91265047 is a prime.

It is a super-2 number, since 2×912814312 = 16664599290815522, which contains 22 as substring.

Together with 91281433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91281394 and 91281403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91281433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45640715 + 45640716.

It is an arithmetic number, because the mean of its divisors is an integer number (45640716).

Almost surely, 291281431 is an apocalyptic number.

91281431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91281431 is an equidigital number, since it uses as much as digits as its factorization.

91281431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 91281431 is about 9554.1316193571. The cubic root of 91281431 is about 450.2573523821.

The spelling of 91281431 in words is "ninety-one million, two hundred eighty-one thousand, four hundred thirty-one".