51811519 has 2 divisors, whose sum is σ = 51811520. Its totient is φ = 51811518.

The previous prime is 51811489. The next prime is 51811523. The reversal of 51811519 is 91511815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51811519 - 2²¹ = 49714367 is a prime.

It is a super-2 number, since 2×51811519² = 5368867002174722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51811549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25905759 + 25905760.

It is an arithmetic number, because the mean of its divisors is an integer number (25905760).

Almost surely, 2^51811519 is an apocalyptic number.

51811519 is a deficient number, since it is larger than the sum of its proper divisors (1).

51811519 is an equidigital number, since it uses as much as digits as its factorization.

51811519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 31.

The square root of 51811519 is about 7198.0218810448. The cubic root of 51811519 is about 372.7996034145.

The spelling of 51811519 in words is "fifty-one million, eight hundred eleven thousand, five hundred nineteen".