91172402 has 8 divisors (see below), whose sum is σ = 139339116. Its totient is φ = 44726032.

The previous prime is 91172387. The next prime is 91172423. The reversal of 91172402 is 20427119.

It can be written as a sum of positive squares in 2 ways, for example, as 89661961 + 1510441 = 9469^2 + 1229^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429953 + ... + 430164.

Almost surely, 2^91172402 is an apocalyptic number.

91172402 is a deficient number, since it is larger than the sum of its proper divisors (48166714).

91172402 is a wasteful number, since it uses less digits than its factorization.

91172402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860172.

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

The square root of 91172402 is about 9548.4240584507. The cubic root of 91172402 is about 450.0780144577.

The spelling of 91172402 in words is "ninety-one million, one hundred seventy-two thousand, four hundred two".