51204731 has 12 divisors (see below), whose sum is σ = 55436832. Its totient is φ = 47269248.

The previous prime is 51204721. The next prime is 51204763. The reversal of 51204731 is 13740215.

It is not a de Polignac number, because 51204731 - 2¹⁰ = 51203707 is a prime.

It is a super-2 number, since 2×51204731² = 5243848953564722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51204697 and 51204706.

It is not an unprimeable number, because it can be changed into a prime (51204721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13646 + ... + 16988.

It is an arithmetic number, because the mean of its divisors is an integer number (4619736).

Almost surely, 2^51204731 is an apocalyptic number.

51204731 is a deficient number, since it is larger than the sum of its proper divisors (4232101).

51204731 is a wasteful number, since it uses less digits than its factorization.

51204731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430 (or 3413 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 51204731 is about 7155.7481090379. The cubic root of 51204731 is about 371.3385435018.

Adding to 51204731 its reverse (13740215), we get a palindrome (64944946).

The spelling of 51204731 in words is "fifty-one million, two hundred four thousand, seven hundred thirty-one".