251240402253 has 4 divisors (see below), whose sum is σ = 334987203008. Its totient is φ = 167493601500.

The previous prime is 251240402221. The next prime is 251240402299. The reversal of 251240402253 is 352204042152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 251240402253 - 2⁵ = 251240402221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251240402253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251240402453) 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, 41873400373 + ... + 41873400378.

It is an arithmetic number, because the mean of its divisors is an integer number (83746800752).

Almost surely, 2^251240402253 is an apocalyptic number.

It is an amenable number.

251240402253 is a deficient number, since it is larger than the sum of its proper divisors (83746800755).

251240402253 is an equidigital number, since it uses as much as digits as its factorization.

251240402253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83746800754.

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 251240402253 in words is "two hundred fifty-one billion, two hundred forty million, four hundred two thousand, two hundred fifty-three".