252420981 has 12 divisors (see below), whose sum is σ = 357524832. Its totient is φ = 158381248.

The previous prime is 252420979. The next prime is 252420991. The reversal of 252420981 is 189024252.

It is not a de Polignac number, because 252420981 - 2¹ = 252420979 is a prime.

It is a super-2 number, since 2×252420981² = 127432703298004722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252420991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144705 + ... + 146438.

It is an arithmetic number, because the mean of its divisors is an integer number (29793736).

Almost surely, 2^252420981 is an apocalyptic number.

It is an amenable number.

252420981 is a deficient number, since it is larger than the sum of its proper divisors (105103851).

252420981 is a wasteful number, since it uses less digits than its factorization.

252420981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291180 (or 291163 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 252420981 is about 15887.7619883985. The cubic root of 252420981 is about 631.9874925755.

The spelling of 252420981 in words is "two hundred fifty-two million, four hundred twenty thousand, nine hundred eighty-one".