251405053 has 2 divisors, whose sum is σ = 251405054. Its totient is φ = 251405052.

The previous prime is 251405041. The next prime is 251405069. The reversal of 251405053 is 350504152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237252409 + 14152644 = 15403^2 + 3762^2 .

It is a cyclic number.

It is not a de Polignac number, because 251405053 - 2⁹ = 251404541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251405003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125702526 + 125702527.

It is an arithmetic number, because the mean of its divisors is an integer number (125702527).

Almost surely, 2^251405053 is an apocalyptic number.

It is an amenable number.

251405053 is a deficient number, since it is larger than the sum of its proper divisors (1).

251405053 is an equidigital number, since it uses as much as digits as its factorization.

251405053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 251405053 is about 15855.7577239311. The cubic root of 251405053 is about 631.1384914560.

Subtracting 251405053 from its reverse (350504152), we obtain a palindrome (99099099).

It can be divided in two parts, 2514050 and 53, that multiplied together give a triangular number (133244650 = T₁₆₃₂₄).

The spelling of 251405053 in words is "two hundred fifty-one million, four hundred five thousand, fifty-three".