61331564 has 12 divisors (see below), whose sum is σ = 122663184. Its totient is φ = 26284944.

The previous prime is 61331551. The next prime is 61331573. The reversal of 61331564 is 46513316.

It is a happy number.

61331564 is an admirable number.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 1095179 + ... + 1095234.

It is an arithmetic number, because the mean of its divisors is an integer number (10221932).

Almost surely, 2^61331564 is an apocalyptic number.

It is an amenable number.

61331564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61331564 is a wasteful number, since it uses less digits than its factorization.

61331564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190424 (or 2190422 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 61331564 is about 7831.4471204242. The cubic root of 61331564 is about 394.3616544150.

The spelling of 61331564 in words is "sixty-one million, three hundred thirty-one thousand, five hundred sixty-four".