252161811 has 48 divisors (see below), whose sum is σ = 421873920. Its totient is φ = 143626560.

The previous prime is 252161807. The next prime is 252161821. The reversal of 252161811 is 118161252.

252161811 is a `hidden beast` number, since 2 + 521 + 61 + 81 + 1 = 666.

It is not a de Polignac number, because 252161811 - 2² = 252161807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252161821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133405 + ... + 135281.

It is an arithmetic number, because the mean of its divisors is an integer number (8789040).

Almost surely, 2^252161811 is an apocalyptic number.

252161811 is a deficient number, since it is larger than the sum of its proper divisors (169712109).

252161811 is a wasteful number, since it uses less digits than its factorization.

252161811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976 (or 1973 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 252161811 is about 15879.6036159597. The cubic root of 252161811 is about 631.7711234937.

The spelling of 252161811 in words is "two hundred fifty-two million, one hundred sixty-one thousand, eight hundred eleven".