91030172 has 12 divisors (see below), whose sum is σ = 168673680. Its totient is φ = 42837696.

The previous prime is 91030169. The next prime is 91030193. The reversal of 91030172 is 27103019.

It is a congruent number.

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, 669272 + ... + 669407.

It is an arithmetic number, because the mean of its divisors is an integer number (14056140).

Almost surely, 2^91030172 is an apocalyptic number.

It is an amenable number.

91030172 is a deficient number, since it is larger than the sum of its proper divisors (77643508).

91030172 is a wasteful number, since it uses less digits than its factorization.

91030172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338700 (or 1338698 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 91030172 is about 9540.9733256099. The cubic root of 91030172 is about 449.8438503492.

It can be divided in two parts, 9103017 and 2, that added together give a palindrome (9103019).

The spelling of 91030172 in words is "ninety-one million, thirty thousand, one hundred seventy-two".