253161405 has 24 divisors (see below), whose sum is σ = 501501312. Its totient is φ = 115730784.

The previous prime is 253161397. The next prime is 253161413. The reversal of 253161405 is 504161352.

253161405 is a `hidden beast` number, since 253 + 1 + 6 + 1 + 405 = 666.

It is an interprime number because it is at equal distance from previous prime (253161397) and next prime (253161413).

It is not a de Polignac number, because 253161405 - 2³ = 253161397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 401529 + ... + 402158.

It is an arithmetic number, because the mean of its divisors is an integer number (20895888).

Almost surely, 2^253161405 is an apocalyptic number.

It is an amenable number.

253161405 is a deficient number, since it is larger than the sum of its proper divisors (248339907).

253161405 is a wasteful number, since it uses less digits than its factorization.

253161405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803705 (or 803702 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 253161405 is about 15911.0466343355. The cubic root of 253161405 is about 632.6048236126.

It can be divided in two parts, 2531 and 61405, that added together give a palindrome (63936).

The spelling of 253161405 in words is "two hundred fifty-three million, one hundred sixty-one thousand, four hundred five".