61531132 has 24 divisors (see below), whose sum is σ = 116402832. Its totient is φ = 28291200.

The previous prime is 61531123. The next prime is 61531133. The reversal of 61531132 is 23113516.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12507 + ... + 16717.

It is an arithmetic number, because the mean of its divisors is an integer number (4850118).

Almost surely, 2^61531132 is an apocalyptic number.

It is an amenable number.

61531132 is a deficient number, since it is larger than the sum of its proper divisors (54871700).

61531132 is a wasteful number, since it uses less digits than its factorization.

61531132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4509 (or 4507 counting only the distinct ones).

The product of its digits is 540, while the sum is 22.

The square root of 61531132 is about 7844.1782233705. The cubic root of 61531132 is about 394.7889317265.

Adding to 61531132 its reverse (23113516), we get a palindrome (84644648).

The spelling of 61531132 in words is "sixty-one million, five hundred thirty-one thousand, one hundred thirty-two".