51131405 has 16 divisors (see below), whose sum is σ = 66259200. Its totient is φ = 37654848.

The previous prime is 51131389. The next prime is 51131411. The reversal of 51131405 is 50413115.

It is a cyclic number.

It is not a de Polignac number, because 51131405 - 2⁴ = 51131389 is a prime.

It is a super-2 number, since 2×51131405² = 5228841154548050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29246 + ... + 30944.

It is an arithmetic number, because the mean of its divisors is an integer number (4141200).

Almost surely, 2^51131405 is an apocalyptic number.

It is an amenable number.

51131405 is a deficient number, since it is larger than the sum of its proper divisors (15127795).

51131405 is a wasteful number, since it uses less digits than its factorization.

51131405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51131405 is about 7150.6227001570. The cubic root of 51131405 is about 371.1612045645.

The spelling of 51131405 in words is "fifty-one million, one hundred thirty-one thousand, four hundred five".