251213402050 has 48 divisors (see below), whose sum is σ = 503489102760. Its totient is φ = 92702384640.

The previous prime is 251213402029. The next prime is 251213402053. The reversal of 251213402050 is 50204312152.

It can be written as a sum of positive squares in 12 ways, for example, as 77668673481 + 173544728569 = 278691^2 + 416587^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (251213402053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1029216 + ... + 1249684.

Almost surely, 2^251213402050 is an apocalyptic number.

251213402050 is an abundant number, since it is smaller than the sum of its proper divisors (252275700710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251213402050 is a wasteful number, since it uses less digits than its factorization.

251213402050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222247 (or 222242 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 251213402050 in words is "two hundred fifty-one billion, two hundred thirteen million, four hundred two thousand, fifty".