91234531 has 2 divisors, whose sum is σ = 91234532. Its totient is φ = 91234530.

The previous prime is 91234487. The next prime is 91234541. The reversal of 91234531 is 13543219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91234531 - 2¹⁵ = 91201763 is a prime.

It is a super-2 number, since 2×91234531² = 16647479293579922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91234531.

It is not a weakly prime, because it can be changed into another prime (91234541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45617265 + 45617266.

It is an arithmetic number, because the mean of its divisors is an integer number (45617266).

Almost surely, 2^91234531 is an apocalyptic number.

91234531 is a deficient number, since it is larger than the sum of its proper divisors (1).

91234531 is an equidigital number, since it uses as much as digits as its factorization.

91234531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 28.

The square root of 91234531 is about 9551.6768684875. The cubic root of 91234531 is about 450.1802257520.

The spelling of 91234531 in words is "ninety-one million, two hundred thirty-four thousand, five hundred thirty-one".