51631450 has 24 divisors (see below), whose sum is σ = 103423068. Its totient is φ = 19063680.

The previous prime is 51631357. The next prime is 51631457. The reversal of 51631450 is 5413615.

It can be written as a sum of positive squares in 6 ways, for example, as 19175641 + 32455809 = 4379^2 + 5697^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51631457) 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, 39067 + ... + 40366.

Almost surely, 2^51631450 is an apocalyptic number.

51631450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51631450 is an abundant number, since it is smaller than the sum of its proper divisors (51791618).

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

51631450 is a wasteful number, since it uses less digits than its factorization.

51631450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79458 (or 79453 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 51631450 is about 7185.5027659865. The cubic root of 51631450 is about 372.3672184130.

The spelling of 51631450 in words is "fifty-one million, six hundred thirty-one thousand, four hundred fifty".