51508819 has 2 divisors, whose sum is σ = 51508820. Its totient is φ = 51508818.

The previous prime is 51508811. The next prime is 51508823. The reversal of 51508819 is 91880515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51508819 - 2³ = 51508811 is a prime.

It is a super-2 number, since 2×51508819² = 5306316869549522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51508811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25754409 + 25754410.

It is an arithmetic number, because the mean of its divisors is an integer number (25754410).

Almost surely, 2^51508819 is an apocalyptic number.

51508819 is a deficient number, since it is larger than the sum of its proper divisors (1).

51508819 is an equidigital number, since it uses as much as digits as its factorization.

51508819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 51508819 is about 7176.9644697462. The cubic root of 51508819 is about 372.0721788297.

The spelling of 51508819 in words is "fifty-one million, five hundred eight thousand, eight hundred nineteen".