51631538 has 8 divisors (see below), whose sum is σ = 88511232. Its totient is φ = 22127796.

The previous prime is 51631537. The next prime is 51631543. The reversal of 51631538 is 83513615.

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

It is not an unprimeable number, because it can be changed into a prime (51631537) 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, 1843970 + ... + 1843997.

It is an arithmetic number, because the mean of its divisors is an integer number (11063904).

Almost surely, 2^51631538 is an apocalyptic number.

51631538 is a deficient number, since it is larger than the sum of its proper divisors (36879694).

51631538 is a wasteful number, since it uses less digits than its factorization.

51631538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687976.

The product of its digits is 10800, while the sum is 32.

The square root of 51631538 is about 7185.5088894246. The cubic root of 51631538 is about 372.3674299656.

The spelling of 51631538 in words is "fifty-one million, six hundred thirty-one thousand, five hundred thirty-eight".