61929581 has 12 divisors (see below), whose sum is σ = 72170208. Its totient is φ = 52987032.

The previous prime is 61929577. The next prime is 61929611. The reversal of 61929581 is 18592916.

It is a happy number.

It is not a de Polignac number, because 61929581 - 2² = 61929577 is a prime.

It is a super-2 number, since 2×61929581² = 7670546005671122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61920581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46730 + ... + 48036.

It is an arithmetic number, because the mean of its divisors is an integer number (6014184).

Almost surely, 2^61929581 is an apocalyptic number.

It is an amenable number.

61929581 is a deficient number, since it is larger than the sum of its proper divisors (10240627).

61929581 is a wasteful number, since it uses less digits than its factorization.

61929581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288 (or 2281 counting only the distinct ones).

The product of its digits is 38880, while the sum is 41.

The square root of 61929581 is about 7869.5349926155. The cubic root of 61929581 is about 395.6392597020.

The spelling of 61929581 in words is "sixty-one million, nine hundred twenty-nine thousand, five hundred eighty-one".