51131906 has 8 divisors (see below), whose sum is σ = 87654720. Its totient is φ = 21913668.

The previous prime is 51131867. The next prime is 51131923. The reversal of 51131906 is 60913115.

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

It is a super-2 number, since 2×51131906² = 5228943622385672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826126 + ... + 1826153.

It is an arithmetic number, because the mean of its divisors is an integer number (10956840).

Almost surely, 2^51131906 is an apocalyptic number.

51131906 is a deficient number, since it is larger than the sum of its proper divisors (36522814).

51131906 is a wasteful number, since it uses less digits than its factorization.

51131906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652288.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 51131906 is about 7150.6577319852. The cubic root of 51131906 is about 371.1624168081.

The spelling of 51131906 in words is "fifty-one million, one hundred thirty-one thousand, nine hundred six".