51149499839 has 4 divisors (see below), whose sum is σ = 51156051024. Its totient is φ = 51142948656.

The previous prime is 51149499757. The next prime is 51149499847. The reversal of 51149499839 is 93899494115.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51149499839 is a prime.

It is a super-2 number, since 2×51149499839² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51149199839) 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, 3263867 + ... + 3279500.

It is an arithmetic number, because the mean of its divisors is an integer number (12789012756).

Almost surely, 2^51149499839 is an apocalyptic number.

51149499839 is a deficient number, since it is larger than the sum of its proper divisors (6551185).

51149499839 is an equidigital number, since it uses as much as digits as its factorization.

51149499839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6551184.

The product of its digits is 12597120, while the sum is 62.

The spelling of 51149499839 in words is "fifty-one billion, one hundred forty-nine million, four hundred ninety-nine thousand, eight hundred thirty-nine".