91973031 has 8 divisors (see below), whose sum is σ = 125240064. Its totient is φ = 60010680.

The previous prime is 91973023. The next prime is 91973033. The reversal of 91973031 is 13037919.

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

It is not a de Polignac number, because 91973031 - 2³ = 91973023 is a prime.

It is a super-2 number, since 2×91973031² = 16918076862653922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91972983 and 91973001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91973033) 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, 326005 + ... + 326286.

It is an arithmetic number, because the mean of its divisors is an integer number (15655008).

Almost surely, 2^91973031 is an apocalyptic number.

91973031 is a deficient number, since it is larger than the sum of its proper divisors (33267033).

91973031 is a wasteful number, since it uses less digits than its factorization.

91973031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652341.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 91973031 is about 9590.2570872735. The cubic root of 91973031 is about 451.3916277488.

The spelling of 91973031 in words is "ninety-one million, nine hundred seventy-three thousand, thirty-one".