251130929 has 12 divisors (see below), whose sum is σ = 292734900. Its totient is φ = 214810848.

The previous prime is 251130881. The next prime is 251130949. The reversal of 251130929 is 929031152.

It can be written as a sum of positive squares in 2 ways, for example, as 135675904 + 115455025 = 11648^2 + 10745^2 .

It is not a de Polignac number, because 251130929 - 2²⁰ = 250082353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251130895 and 251130904.

It is not an unprimeable number, because it can be changed into a prime (251130949) 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, 19907 + ... + 29975.

It is an arithmetic number, because the mean of its divisors is an integer number (24394575).

Almost surely, 2^251130929 is an apocalyptic number.

It is an amenable number.

251130929 is a deficient number, since it is larger than the sum of its proper divisors (41603971).

251130929 is a wasteful number, since it uses less digits than its factorization.

251130929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10592 (or 10585 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 251130929 is about 15847.1110616415. Note that the first 3 decimals coincide. The cubic root of 251130929 is about 630.9090169811.

The spelling of 251130929 in words is "two hundred fifty-one million, one hundred thirty thousand, nine hundred twenty-nine".