253661043 has 16 divisors (see below), whose sum is σ = 353479680. Its totient is φ = 161498304.

The previous prime is 253661041. The next prime is 253661047. The reversal of 253661043 is 340166352.

It is not a de Polignac number, because 253661043 - 2¹ = 253661041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 253661043.

It is not an unprimeable number, because it can be changed into a prime (253661041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47055 + ... + 52167.

It is an arithmetic number, because the mean of its divisors is an integer number (22092480).

Almost surely, 2^253661043 is an apocalyptic number.

253661043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

253661043 is a deficient number, since it is larger than the sum of its proper divisors (99818637).

253661043 is a wasteful number, since it uses less digits than its factorization.

253661043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5858.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 253661043 is about 15926.7398735586. The cubic root of 253661043 is about 633.0207186328.

The spelling of 253661043 in words is "two hundred fifty-three million, six hundred sixty-one thousand, forty-three".