51213532 has 12 divisors (see below), whose sum is σ = 89840520. Its totient is φ = 25544816.

The previous prime is 51213523. The next prime is 51213583. The reversal of 51213532 is 23531215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13603 + ... + 16954.

It is an arithmetic number, because the mean of its divisors is an integer number (7486710).

Almost surely, 2^51213532 is an apocalyptic number.

It is an amenable number.

51213532 is a deficient number, since it is larger than the sum of its proper divisors (38626988).

51213532 is a wasteful number, since it uses less digits than its factorization.

51213532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30980 (or 30978 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 51213532 is about 7156.3630427753. The cubic root of 51213532 is about 371.3598173387.

Adding to 51213532 its reverse (23531215), we get a palindrome (74744747).

The spelling of 51213532 in words is "fifty-one million, two hundred thirteen thousand, five hundred thirty-two".