51531451 has 2 divisors, whose sum is σ = 51531452. Its totient is φ = 51531450.

The previous prime is 51531433. The next prime is 51531511. The reversal of 51531451 is 15413515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51531451 - 2⁵ = 51531419 is a prime.

It is not a weakly prime, because it can be changed into another prime (51531251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765725 + 25765726.

It is an arithmetic number, because the mean of its divisors is an integer number (25765726).

Almost surely, 2^51531451 is an apocalyptic number.

51531451 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531451 is an equidigital number, since it uses as much as digits as its factorization.

51531451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500, while the sum is 25.

The square root of 51531451 is about 7178.5410077536. The cubic root of 51531451 is about 372.1266646745.

Adding to 51531451 its reverse (15413515), we get a palindrome (66944966).

The spelling of 51531451 in words is "fifty-one million, five hundred thirty-one thousand, four hundred fifty-one".