91042831 has 8 divisors (see below), whose sum is σ = 99391824. Its totient is φ = 82705920.

The previous prime is 91042799. The next prime is 91042849. The reversal of 91042831 is 13824019.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91042831 - 2⁵ = 91042799 is a prime.

It is a super-2 number, since 2×91042831² = 16577594152989122, which contains 22 as substring.

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 91042831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91042891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21285 + ... + 25201.

It is an arithmetic number, because the mean of its divisors is an integer number (12423978).

Almost surely, 2^91042831 is an apocalyptic number.

91042831 is a deficient number, since it is larger than the sum of its proper divisors (8348993).

91042831 is a wasteful number, since it uses less digits than its factorization.

91042831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6041.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 91042831 is about 9541.6367044653. The cubic root of 91042831 is about 449.8647017117.

It can be divided in two parts, 9104 and 2831, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 91042831 in words is "ninety-one million, forty-two thousand, eight hundred thirty-one".