51651251339 has 4 divisors (see below), whose sum is σ = 52273555656. Its totient is φ = 51028947024.

The previous prime is 51651251329. The next prime is 51651251341. The reversal of 51651251339 is 93315215615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51651251339 - 2³² = 47356284043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51651251296 and 51651251305.

It is not an unprimeable number, because it can be changed into a prime (51651251329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311152034 + ... + 311152199.

It is an arithmetic number, because the mean of its divisors is an integer number (13068388914).

Almost surely, 2^51651251339 is an apocalyptic number.

51651251339 is a deficient number, since it is larger than the sum of its proper divisors (622304317).

51651251339 is an equidigital number, since it uses as much as digits as its factorization.

51651251339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622304316.

The product of its digits is 121500, while the sum is 41.

The spelling of 51651251339 in words is "fifty-one billion, six hundred fifty-one million, two hundred fifty-one thousand, three hundred thirty-nine".