51311404 has 12 divisors (see below), whose sum is σ = 91705824. Its totient is φ = 25109744.

The previous prime is 51311401. The next prime is 51311441. The reversal of 51311404 is 40411315.

It is not an unprimeable number, because it can be changed into a prime (51311401) 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, 136279 + ... + 136654.

It is an arithmetic number, because the mean of its divisors is an integer number (7642152).

Almost surely, 2^51311404 is an apocalyptic number.

It is an amenable number.

51311404 is a deficient number, since it is larger than the sum of its proper divisors (40394420).

51311404 is a wasteful number, since it uses less digits than its factorization.

51311404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272984 (or 272982 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51311404 is about 7163.1978892112. The cubic root of 51311404 is about 371.5962301138.

Adding to 51311404 its reverse (40411315), we get a palindrome (91722719).

It can be divided in two parts, 51311 and 404, that added together give a palindrome (51715).

The spelling of 51311404 in words is "fifty-one million, three hundred eleven thousand, four hundred four".