91402172 has 24 divisors (see below), whose sum is σ = 162397872. Its totient is φ = 45008000.

The previous prime is 91402147. The next prime is 91402177. The reversal of 91402172 is 27120419.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91402177) 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, 93647 + ... + 94617.

It is an arithmetic number, because the mean of its divisors is an integer number (6766578).

Almost surely, 2^91402172 is an apocalyptic number.

It is an amenable number.

91402172 is a deficient number, since it is larger than the sum of its proper divisors (70995700).

91402172 is a wasteful number, since it uses less digits than its factorization.

91402172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1307 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 91402172 is about 9560.4483158480. The cubic root of 91402172 is about 450.4557883986.

The spelling of 91402172 in words is "ninety-one million, four hundred two thousand, one hundred seventy-two".