51698539 has 2 divisors, whose sum is σ = 51698540. Its totient is φ = 51698538.

The previous prime is 51698533. The next prime is 51698609. The reversal of 51698539 is 93589615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51698539 - 2¹⁹ = 51174251 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51698533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25849269 + 25849270.

It is an arithmetic number, because the mean of its divisors is an integer number (25849270).

Almost surely, 2^51698539 is an apocalyptic number.

51698539 is a deficient number, since it is larger than the sum of its proper divisors (1).

51698539 is an equidigital number, since it uses as much as digits as its factorization.

51698539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 46.

The square root of 51698539 is about 7190.1696085697. The cubic root of 51698539 is about 372.5284310837.

The spelling of 51698539 in words is "fifty-one million, six hundred ninety-eight thousand, five hundred thirty-nine".