91172842 has 8 divisors (see below), whose sum is σ = 136800000. Its totient is φ = 45572844.

The previous prime is 91172833. The next prime is 91172843. The reversal of 91172842 is 24827119.

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

It is a junction number, because it is equal to n+sod(n) for n = 91172798 and 91172807.

It is not an unprimeable number, because it can be changed into a prime (91172843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8409 + ... + 15907.

It is an arithmetic number, because the mean of its divisors is an integer number (17100000).

Almost surely, 2^91172842 is an apocalyptic number.

91172842 is a deficient number, since it is larger than the sum of its proper divisors (45627158).

91172842 is a wasteful number, since it uses less digits than its factorization.

91172842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13580.

The product of its digits is 8064, while the sum is 34.

The square root of 91172842 is about 9548.4470988742. The cubic root of 91172842 is about 450.0787384854.

The spelling of 91172842 in words is "ninety-one million, one hundred seventy-two thousand, eight hundred forty-two".