51193731 has 8 divisors (see below), whose sum is σ = 68367040. Its totient is φ = 34074792.

The previous prime is 51193717. The next prime is 51193757. The reversal of 51193731 is 13739115.

It is a happy number.

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

It is not a de Polignac number, because 51193731 - 2⁷ = 51193603 is a prime.

It is a super-2 number, since 2×51193731² = 5241596187400722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51193711) 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, 11341 + ... + 15198.

It is an arithmetic number, because the mean of its divisors is an integer number (8545880).

Almost surely, 2^51193731 is an apocalyptic number.

51193731 is a deficient number, since it is larger than the sum of its proper divisors (17173309).

51193731 is a wasteful number, since it uses less digits than its factorization.

51193731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27185.

The product of its digits is 2835, while the sum is 30.

The square root of 51193731 is about 7154.9794548971. The cubic root of 51193731 is about 371.3119507994.

The spelling of 51193731 in words is "fifty-one million, one hundred ninety-three thousand, seven hundred thirty-one".