51136919 has 2 divisors, whose sum is σ = 51136920. Its totient is φ = 51136918.

The previous prime is 51136913. The next prime is 51136951. The reversal of 51136919 is 91963115.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51136919 is a prime.

It is a super-2 number, since 2×51136919² = 5229968969625122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51136913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25568459 + 25568460.

It is an arithmetic number, because the mean of its divisors is an integer number (25568460).

Almost surely, 2^51136919 is an apocalyptic number.

51136919 is a deficient number, since it is larger than the sum of its proper divisors (1).

51136919 is an equidigital number, since it uses as much as digits as its factorization.

51136919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290, while the sum is 35.

The square root of 51136919 is about 7151.0082505896. The cubic root of 51136919 is about 371.1745460671.

The spelling of 51136919 in words is "fifty-one million, one hundred thirty-six thousand, nine hundred nineteen".