91471431 has 8 divisors (see below), whose sum is σ = 122091904. Its totient is φ = 60915960.

The previous prime is 91471399. The next prime is 91471463. The reversal of 91471431 is 13417419.

It is an interprime number because it is at equal distance from previous prime (91471399) and next prime (91471463).

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

It is not a de Polignac number, because 91471431 - 2⁵ = 91471399 is a prime.

It is a super-2 number, since 2×91471431² = 16734045378375522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91471231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12865 + ... + 18666.

It is an arithmetic number, because the mean of its divisors is an integer number (15261488).

Almost surely, 2^91471431 is an apocalyptic number.

91471431 is a deficient number, since it is larger than the sum of its proper divisors (30620473).

91471431 is a wasteful number, since it uses less digits than its factorization.

91471431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32501.

The product of its digits is 3024, while the sum is 30.

The square root of 91471431 is about 9564.0697927190. The cubic root of 91471431 is about 450.5695356619.

The spelling of 91471431 in words is "ninety-one million, four hundred seventy-one thousand, four hundred thirty-one".