51321499 has 2 divisors, whose sum is σ = 51321500. Its totient is φ = 51321498.

The previous prime is 51321469. The next prime is 51321511. The reversal of 51321499 is 99412315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51321499 - 2⁷ = 51321371 is a prime.

It is not a weakly prime, because it can be changed into another prime (51321449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660749 + 25660750.

It is an arithmetic number, because the mean of its divisors is an integer number (25660750).

Almost surely, 2^51321499 is an apocalyptic number.

51321499 is a deficient number, since it is larger than the sum of its proper divisors (1).

51321499 is an equidigital number, since it uses as much as digits as its factorization.

51321499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 51321499 is about 7163.9024979406. The cubic root of 51321499 is about 371.6205977831.

The spelling of 51321499 in words is "fifty-one million, three hundred twenty-one thousand, four hundred ninety-nine".