51131278 has 8 divisors (see below), whose sum is σ = 83669400. Its totient is φ = 23241480.

The previous prime is 51131243. The next prime is 51131279. The reversal of 51131278 is 87213115.

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

It is a super-2 number, since 2×51131278² = 5228815179826568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131279) 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, 1162053 + ... + 1162096.

It is an arithmetic number, because the mean of its divisors is an integer number (10458675).

Almost surely, 2^51131278 is an apocalyptic number.

51131278 is a deficient number, since it is larger than the sum of its proper divisors (32538122).

51131278 is a wasteful number, since it uses less digits than its factorization.

51131278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324162.

The product of its digits is 1680, while the sum is 28.

The square root of 51131278 is about 7150.6138198060. The cubic root of 51131278 is about 371.1608972679.

The spelling of 51131278 in words is "fifty-one million, one hundred thirty-one thousand, two hundred seventy-eight".