191515972 has 12 divisors (see below), whose sum is σ = 352792720. Its totient is φ = 90718056.

The previous prime is 191515967. The next prime is 191515993. The reversal of 191515972 is 279515191.

It is a super-2 number, since 2×191515972² = 73356735062209568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259898 + ... + 1260049.

Almost surely, 2^191515972 is an apocalyptic number.

It is an amenable number.

191515972 is a deficient number, since it is larger than the sum of its proper divisors (161276748).

191515972 is a wasteful number, since it uses less digits than its factorization.

191515972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519970 (or 2519968 counting only the distinct ones).

The product of its digits is 28350, while the sum is 40.

The square root of 191515972 is about 13838.9295828832. The cubic root of 191515972 is about 576.4146360252.

The spelling of 191515972 in words is "one hundred ninety-one million, five hundred fifteen thousand, nine hundred seventy-two".