251002051 has 4 divisors (see below), whose sum is σ = 256839352. Its totient is φ = 245164752.

The previous prime is 251002001. The next prime is 251002061. The reversal of 251002051 is 150200152.

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

It is a cyclic number.

It is not a de Polignac number, because 251002051 - 2¹¹ = 251000003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251002001) 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, 2918586 + ... + 2918671.

It is an arithmetic number, because the mean of its divisors is an integer number (64209838).

Almost surely, 2^251002051 is an apocalyptic number.

251002051 is a deficient number, since it is larger than the sum of its proper divisors (5837301).

251002051 is an equidigital number, since it uses as much as digits as its factorization.

251002051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5837300.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 251002051 is about 15843.0442466087. The cubic root of 251002051 is about 630.8010730150.

The spelling of 251002051 in words is "two hundred fifty-one million, two thousand, fifty-one".