91155431 has 2 divisors, whose sum is σ = 91155432. Its totient is φ = 91155430.

The previous prime is 91155391. The next prime is 91155451. The reversal of 91155431 is 13455119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91155431 - 2¹⁸ = 90893287 is a prime.

It is a super-2 number, since 2×91155431² = 16618625201591522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91155394 and 91155403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91155451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45577715 + 45577716.

It is an arithmetic number, because the mean of its divisors is an integer number (45577716).

Almost surely, 2^91155431 is an apocalyptic number.

91155431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91155431 is an equidigital number, since it uses as much as digits as its factorization.

91155431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 29.

The square root of 91155431 is about 9547.5353364101. The cubic root of 91155431 is about 450.0500866060.

The spelling of 91155431 in words is "ninety-one million, one hundred fifty-five thousand, four hundred thirty-one".