252180981 has 12 divisors (see below), whose sum is σ = 392281708. Its totient is φ = 155188224.

The previous prime is 252180967. The next prime is 252180989. The reversal of 252180981 is 189081252.

It can be written as a sum of positive squares in 2 ways, for example, as 138438756 + 113742225 = 11766^2 + 10665^2 .

It is not a de Polignac number, because 252180981 - 2⁵ = 252180949 is a prime.

It is a super-2 number, since 2×252180981² = 127190494356244722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252180989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1077580 + ... + 1077813.

Almost surely, 2^252180981 is an apocalyptic number.

It is an amenable number.

252180981 is a deficient number, since it is larger than the sum of its proper divisors (140100727).

252180981 is a wasteful number, since it uses less digits than its factorization.

252180981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155412 (or 2155409 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 252180981 is about 15880.2072089756. The cubic root of 252180981 is about 631.7871327188.

The spelling of 252180981 in words is "two hundred fifty-two million, one hundred eighty thousand, nine hundred eighty-one".