51399131 has 8 divisors (see below), whose sum is σ = 59117280. Its totient is φ = 43774848.

The previous prime is 51399097. The next prime is 51399137. The reversal of 51399131 is 13199315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51399131 is a prime.

It is a super-2 number, since 2×51399131² = 5283741335110322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51399137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22286 + ... + 24483.

It is an arithmetic number, because the mean of its divisors is an integer number (7389660).

Almost surely, 2^51399131 is an apocalyptic number.

51399131 is a deficient number, since it is larger than the sum of its proper divisors (7718149).

51399131 is a wasteful number, since it uses less digits than its factorization.

51399131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46933.

The product of its digits is 3645, while the sum is 32.

The square root of 51399131 is about 7169.3187263505. The cubic root of 51399131 is about 371.8078819716.

The spelling of 51399131 in words is "fifty-one million, three hundred ninety-nine thousand, one hundred thirty-one".