51531511 has 2 divisors, whose sum is σ = 51531512. Its totient is φ = 51531510.

The previous prime is 51531451. The next prime is 51531527. The reversal of 51531511 is 11513515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51531511 - 2¹⁷ = 51400439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51531551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765755 + 25765756.

It is an arithmetic number, because the mean of its divisors is an integer number (25765756).

Almost surely, 2^51531511 is an apocalyptic number.

51531511 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531511 is an equidigital number, since it uses as much as digits as its factorization.

51531511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 375, while the sum is 22.

The square root of 51531511 is about 7178.5451868746. The cubic root of 51531511 is about 372.1268091014.

The spelling of 51531511 in words is "fifty-one million, five hundred thirty-one thousand, five hundred eleven".