51207131 has 8 divisors (see below), whose sum is σ = 53512704. Its totient is φ = 48908200.

The previous prime is 51207119. The next prime is 51207151. The reversal of 51207131 is 13170215.

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

It is a cyclic number.

It is not a de Polignac number, because 51207131 - 2²² = 47012827 is a prime.

It is a super-2 number, since 2×51207131² = 5244340530502322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51207151) 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, 20606 + ... + 22956.

It is an arithmetic number, because the mean of its divisors is an integer number (6689088).

Almost surely, 2^51207131 is an apocalyptic number.

51207131 is a deficient number, since it is larger than the sum of its proper divisors (2305573).

51207131 is a wasteful number, since it uses less digits than its factorization.

51207131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 51207131 is about 7155.9158044236. The cubic root of 51207131 is about 371.3443450398.

Adding to 51207131 its reverse (13170215), we get a palindrome (64377346).

The spelling of 51207131 in words is "fifty-one million, two hundred seven thousand, one hundred thirty-one".