253261161 has 22 divisors (see below), whose sum is σ = 379978170. Its totient is φ = 168801408.

The previous prime is 253261157. The next prime is 253261171. The reversal of 253261161 is 161162352.

It can be written as a sum of positive squares in only one way, i.e., 249482025 + 3779136 = 15795^2 + 1944^2 .

It is not a de Polignac number, because 253261161 - 2² = 253261157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (253261171) by changing a digit.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 56905 + ... + 61193.

It is an arithmetic number, because the mean of its divisors is an integer number (17271735).

Almost surely, 2^253261161 is an apocalyptic number.

It is an amenable number.

253261161 is a deficient number, since it is larger than the sum of its proper divisors (126717009).

253261161 is an frugal number, since it uses more digits than its factorization.

253261161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319 (or 4292 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 253261161 is about 15914.1811287920. The cubic root of 253261161 is about 632.6879034694.

The spelling of 253261161 in words is "two hundred fifty-three million, two hundred sixty-one thousand, one hundred sixty-one".