51540232 has 16 divisors (see below), whose sum is σ = 97862400. Its totient is φ = 25443600.

The previous prime is 51540211. The next prime is 51540233. The reversal of 51540232 is 23204515.

It is a super-2 number, since 2×51540232² = 5312791029227648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51540233) 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, 40144 + ... + 41407.

It is an arithmetic number, because the mean of its divisors is an integer number (6116400).

Almost surely, 2^51540232 is an apocalyptic number.

It is an amenable number.

51540232 is a deficient number, since it is larger than the sum of its proper divisors (46322168).

51540232 is a wasteful number, since it uses less digits than its factorization.

51540232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81636 (or 81632 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 51540232 is about 7179.1525962331. The cubic root of 51540232 is about 372.1478003666.

Adding to 51540232 its reverse (23204515), we get a palindrome (74744747).

The spelling of 51540232 in words is "fifty-one million, five hundred forty thousand, two hundred thirty-two".