61610561 has 8 divisors (see below), whose sum is σ = 63033600. Its totient is φ = 60192288.

The previous prime is 61610557. The next prime is 61610579. The reversal of 61610561 is 16501616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61610561 - 2² = 61610557 is a prime.

It is a super-2 number, since 2×61610561² = 7591722453469442, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61610561.

It is not an unprimeable number, because it can be changed into a prime (61610501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43340 + ... + 44738.

It is an arithmetic number, because the mean of its divisors is an integer number (7879200).

Almost surely, 2^61610561 is an apocalyptic number.

It is an amenable number.

61610561 is a deficient number, since it is larger than the sum of its proper divisors (1423039).

61610561 is a wasteful number, since it uses less digits than its factorization.

61610561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 61610561 is about 7849.2395173036. The cubic root of 61610561 is about 394.9587330707.

The spelling of 61610561 in words is "sixty-one million, six hundred ten thousand, five hundred sixty-one".