200991172 has 6 divisors (see below), whose sum is σ = 351734558. Its totient is φ = 100495584.

The previous prime is 200991169. The next prime is 200991173. The reversal of 200991172 is 271199002.

It can be written as a sum of positive squares in only one way, i.e., 157351936 + 43639236 = 12544^2 + 6606^2 .

It is not an unprimeable number, because it can be changed into a prime (200991173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25123893 + ... + 25123900.

Almost surely, 2^200991172 is an apocalyptic number.

It is an amenable number.

200991172 is a deficient number, since it is larger than the sum of its proper divisors (150743386).

200991172 is a wasteful number, since it uses less digits than its factorization.

200991172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50247797 (or 50247795 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 200991172 is about 14177.1355357844. The cubic root of 200991172 is about 585.7680242924.

The spelling of 200991172 in words is "two hundred million, nine hundred ninety-one thousand, one hundred seventy-two".