251061051 has 4 divisors (see below), whose sum is σ = 334748072. Its totient is φ = 167374032.

The previous prime is 251061037. The next prime is 251061059. The reversal of 251061051 is 150160152.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 251061051 - 2⁷ = 251060923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251061059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41843506 + ... + 41843511.

It is an arithmetic number, because the mean of its divisors is an integer number (83687018).

Almost surely, 2^251061051 is an apocalyptic number.

251061051 is a deficient number, since it is larger than the sum of its proper divisors (83687021).

251061051 is an equidigital number, since it uses as much as digits as its factorization.

251061051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83687020.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 251061051 is about 15844.9061530828. The cubic root of 251061051 is about 630.8504940555.

The spelling of 251061051 in words is "two hundred fifty-one million, sixty-one thousand, fifty-one".