51768919 has 2 divisors, whose sum is σ = 51768920. Its totient is φ = 51768918.

The previous prime is 51768887. The next prime is 51768967. The reversal of 51768919 is 91986715.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51768919 - 2⁵ = 51768887 is a prime.

It is a super-2 number, since 2×51768919² = 5360041948857122, 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 (51768989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25884459 + 25884460.

It is an arithmetic number, because the mean of its divisors is an integer number (25884460).

Almost surely, 2^51768919 is an apocalyptic number.

51768919 is a deficient number, since it is larger than the sum of its proper divisors (1).

51768919 is an equidigital number, since it uses as much as digits as its factorization.

51768919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 46.

The square root of 51768919 is about 7195.0621262085. The cubic root of 51768919 is about 372.6974020895.

The spelling of 51768919 in words is "fifty-one million, seven hundred sixty-eight thousand, nine hundred nineteen".