51931480 has 32 divisors (see below), whose sum is σ = 117514800. Its totient is φ = 20653696.

The previous prime is 51931463. The next prime is 51931483. The reversal of 51931480 is 8413915.

It is a super-2 number, since 2×51931480² = 5393757229980800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51931483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3534 + ... + 10786.

Almost surely, 2^51931480 is an apocalyptic number.

It is an amenable number.

51931480 is an abundant number, since it is smaller than the sum of its proper divisors (65583320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51931480 is a wasteful number, since it uses less digits than its factorization.

51931480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7443 (or 7439 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51931480 is about 7206.3499776239. The cubic root of 51931480 is about 373.0871002453.

The spelling of 51931480 in words is "fifty-one million, nine hundred thirty-one thousand, four hundred eighty".