252671991 has 32 divisors (see below), whose sum is σ = 397017600. Its totient is φ = 140918400.

The previous prime is 252671987. The next prime is 252672011. The reversal of 252671991 is 199176252.

It is not a de Polignac number, because 252671991 - 2² = 252671987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252671981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179910 + ... + 181308.

It is an arithmetic number, because the mean of its divisors is an integer number (12406800).

Almost surely, 2^252671991 is an apocalyptic number.

252671991 is a deficient number, since it is larger than the sum of its proper divisors (144345609).

252671991 is a wasteful number, since it uses less digits than its factorization.

252671991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847.

The product of its digits is 68040, while the sum is 42.

The square root of 252671991 is about 15895.6595018892. The cubic root of 252671991 is about 632.1969081136.

The spelling of 252671991 in words is "two hundred fifty-two million, six hundred seventy-one thousand, nine hundred ninety-one".