251545211053 has 4 divisors (see below), whose sum is σ = 252999229788. Its totient is φ = 250091192320.

The previous prime is 251545211051. The next prime is 251545211059. The reversal of 251545211053 is 350112545152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 243628126569 + 7917084484 = 493587^2 + 88978^2 .

It is a cyclic number.

It is not a de Polignac number, because 251545211053 - 2¹ = 251545211051 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 (251545211051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727009108 + ... + 727009453.

It is an arithmetic number, because the mean of its divisors is an integer number (63249807447).

Almost surely, 2^251545211053 is an apocalyptic number.

It is an amenable number.

251545211053 is a deficient number, since it is larger than the sum of its proper divisors (1454018735).

251545211053 is a wasteful number, since it uses less digits than its factorization.

251545211053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454018734.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 251545211053 in words is "two hundred fifty-one billion, five hundred forty-five million, two hundred eleven thousand, fifty-three".