251280730129 has 12 divisors (see below), whose sum is σ = 297447375988. Its totient is φ = 210864947040.

The previous prime is 251280730067. The next prime is 251280730139. The reversal of 251280730129 is 921037082152.

It can be written as a sum of positive squares in 2 ways, for example, as 76188696529 + 175092033600 = 276023^2 + 418440^2 .

It is a de Polignac number, because none of the positive numbers 2^k-251280730129 is a prime.

It is a super-3 number, since 3×251280730129³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251280730091 and 251280730100.

It is not an unprimeable number, because it can be changed into a prime (251280730139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79871514 + ... + 79874659.

Almost surely, 2^251280730129 is an apocalyptic number.

It is an amenable number.

251280730129 is a deficient number, since it is larger than the sum of its proper divisors (46166645859).

251280730129 is a wasteful number, since it uses less digits than its factorization.

251280730129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159746208 (or 159746197 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 251280730129 in words is "two hundred fifty-one billion, two hundred eighty million, seven hundred thirty thousand, one hundred twenty-nine".