51401232 has 60 divisors (see below), whose sum is σ = 151431280. Its totient is φ = 16231104.

The previous prime is 51401219. The next prime is 51401237. The reversal of 51401232 is 23210415.

It is a super-2 number, since 2×51401232² = 5284173302235648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51401237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6658 + ... + 12129.

Almost surely, 2^51401232 is an apocalyptic number.

It is an amenable number.

51401232 is an abundant number, since it is smaller than the sum of its proper divisors (100030048).

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

51401232 is a wasteful number, since it uses less digits than its factorization.

51401232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18820 (or 18811 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51401232 is about 7169.4652520254. The cubic root of 51401232 is about 371.8129479309.

Adding to 51401232 its reverse (23210415), we get a palindrome (74611647).

The spelling of 51401232 in words is "fifty-one million, four hundred one thousand, two hundred thirty-two".