251420255 has 12 divisors (see below), whose sum is σ = 318421512. Its totient is φ = 190548720.

The previous prime is 251420243. The next prime is 251420263. The reversal of 251420255 is 552024152.

It is not a de Polignac number, because 251420255 - 2¹² = 251416159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67841 + ... + 71450.

It is an arithmetic number, because the mean of its divisors is an integer number (26535126).

Almost surely, 2^251420255 is an apocalyptic number.

251420255 is a deficient number, since it is larger than the sum of its proper divisors (67001257).

251420255 is a wasteful number, since it uses less digits than its factorization.

251420255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139334 (or 139315 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 251420255 is about 15856.2371009013. The cubic root of 251420255 is about 631.1512124599.

The spelling of 251420255 in words is "two hundred fifty-one million, four hundred twenty thousand, two hundred fifty-five".