51516419 has 2 divisors, whose sum is σ = 51516420. Its totient is φ = 51516418.

The previous prime is 51516403. The next prime is 51516431. The reversal of 51516419 is 91461515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51516419 - 2⁴ = 51516403 is a prime.

It is a super-2 number, since 2×51516419² = 5307882853167122, which contains 22 as substring.

It is equal to p_3086564 and since 51516419 and 3086564 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51516449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25758209 + 25758210.

It is an arithmetic number, because the mean of its divisors is an integer number (25758210).

Almost surely, 2^51516419 is an apocalyptic number.

51516419 is a deficient number, since it is larger than the sum of its proper divisors (1).

51516419 is an equidigital number, since it uses as much as digits as its factorization.

51516419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 32.

The square root of 51516419 is about 7177.4939219758. The cubic root of 51516419 is about 372.0904773758.

The spelling of 51516419 in words is "fifty-one million, five hundred sixteen thousand, four hundred nineteen".