251130905 has 16 divisors (see below), whose sum is σ = 318898944. Its totient is φ = 189456960.

The previous prime is 251130881. The next prime is 251130949. The reversal of 251130905 is 509031152.

It is not a de Polignac number, because 251130905 - 2¹⁰ = 251129881 is a prime.

It is a super-2 number, since 2×251130905² = 126133462892238050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7214 + ... + 23543.

It is an arithmetic number, because the mean of its divisors is an integer number (19931184).

Almost surely, 2^251130905 is an apocalyptic number.

It is an amenable number.

251130905 is a deficient number, since it is larger than the sum of its proper divisors (67768039).

251130905 is a wasteful number, since it uses less digits than its factorization.

251130905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30856.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 251130905 is about 15847.1103044057. The cubic root of 251130905 is about 630.9089968830.

The spelling of 251130905 in words is "two hundred fifty-one million, one hundred thirty thousand, nine hundred five".