61531588 has 12 divisors (see below), whose sum is σ = 107820972. Its totient is φ = 30725600.

The previous prime is 61531583. The next prime is 61531607. The reversal of 61531588 is 88513516.

It can be written as a sum of positive squares in 2 ways, for example, as 32285124 + 29246464 = 5682^2 + 5408^2 .

It is a super-2 number, since 2×61531588² = 7572272643603488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61531583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6463 + ... + 12838.

It is an arithmetic number, because the mean of its divisors is an integer number (8985081).

Almost surely, 2^61531588 is an apocalyptic number.

It is an amenable number.

61531588 is a deficient number, since it is larger than the sum of its proper divisors (46289384).

61531588 is a wasteful number, since it uses less digits than its factorization.

61531588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20102 (or 20100 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 61531588 is about 7844.2072894589. The cubic root of 61531588 is about 394.7899069689.

The spelling of 61531588 in words is "sixty-one million, five hundred thirty-one thousand, five hundred eighty-eight".