51919499 has 2 divisors, whose sum is σ = 51919500. Its totient is φ = 51919498.

The previous prime is 51919493. The next prime is 51919507. The reversal of 51919499 is 99491915.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51919499 is a prime.

It is a super-2 number, since 2×51919499² = 5391268752822002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51919493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25959749 + 25959750.

It is an arithmetic number, because the mean of its divisors is an integer number (25959750).

Almost surely, 2^51919499 is an apocalyptic number.

51919499 is a deficient number, since it is larger than the sum of its proper divisors (1).

51919499 is an equidigital number, since it uses as much as digits as its factorization.

51919499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 47.

The square root of 51919499 is about 7205.5186489246. The cubic root of 51919499 is about 373.0584066646.

The spelling of 51919499 in words is "fifty-one million, nine hundred nineteen thousand, four hundred ninety-nine".