2551531 has 2 divisors, whose sum is σ = 2551532. Its totient is φ = 2551530.

The previous prime is 2551511. The next prime is 2551543. The reversal of 2551531 is 1351552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2551531 - 2⁵ = 2551499 is a prime.

It is a super-2 number, since 2×2551531² = 13020620887922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2551501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275765 + 1275766.

It is an arithmetic number, because the mean of its divisors is an integer number (1275766).

2^2551531 is an apocalyptic number.

2551531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551531 is an equidigital number, since it uses as much as digits as its factorization.

2551531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 750, while the sum is 22.

The square root of 2551531 is about 1597.3512450303. The cubic root of 2551531 is about 136.6470571376.

The spelling of 2551531 in words is "two million, five hundred fifty-one thousand, five hundred thirty-one".