251265150121 has 8 divisors (see below), whose sum is σ = 251431926984. Its totient is φ = 251098423680.

The previous prime is 251265150119. The next prime is 251265150139. The reversal of 251265150121 is 121051562152.

It can be written as a sum of positive squares in 4 ways, for example, as 239327402521 + 11937747600 = 489211^2 + 109260^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251265150121 - 2¹ = 251265150119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251265150161) 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 7 ways as a sum of consecutive naturals, for example, 16206045 + ... + 16221541.

It is an arithmetic number, because the mean of its divisors is an integer number (31428990873).

Almost surely, 2^251265150121 is an apocalyptic number.

It is an amenable number.

251265150121 is a deficient number, since it is larger than the sum of its proper divisors (166776863).

251265150121 is a wasteful number, since it uses less digits than its factorization.

251265150121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25211.

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 251265150121 in words is "two hundred fifty-one billion, two hundred sixty-five million, one hundred fifty thousand, one hundred twenty-one".