61259561 has 16 divisors (see below), whose sum is σ = 68160960. Its totient is φ = 54592320.

The previous prime is 61259543. The next prime is 61259579. The reversal of 61259561 is 16595216.

It is an interprime number because it is at equal distance from previous prime (61259543) and next prime (61259579).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61259561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61259461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208931 + ... + 209223.

It is an arithmetic number, because the mean of its divisors is an integer number (4260060).

Almost surely, 2^61259561 is an apocalyptic number.

It is an amenable number.

61259561 is a deficient number, since it is larger than the sum of its proper divisors (6901399).

61259561 is a wasteful number, since it uses less digits than its factorization.

61259561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its digits is 16200, while the sum is 35.

The square root of 61259561 is about 7826.8487272976. The cubic root of 61259561 is about 394.2072676710.

The spelling of 61259561 in words is "sixty-one million, two hundred fifty-nine thousand, five hundred sixty-one".