253661015 has 4 divisors (see below), whose sum is σ = 304393224. Its totient is φ = 202928808.

The previous prime is 253660987. The next prime is 253661017. The reversal of 253661015 is 510166352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 253661015 - 2¹⁴ = 253644631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253661017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25366097 + ... + 25366106.

It is an arithmetic number, because the mean of its divisors is an integer number (76098306).

Almost surely, 2^253661015 is an apocalyptic number.

253661015 is a deficient number, since it is larger than the sum of its proper divisors (50732209).

253661015 is an equidigital number, since it uses as much as digits as its factorization.

253661015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50732208.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 253661015 is about 15926.7389945337. The cubic root of 253661015 is about 633.0206953412.

The spelling of 253661015 in words is "two hundred fifty-three million, six hundred sixty-one thousand, fifteen".