61611641 has 16 divisors (see below), whose sum is σ = 79129344. Its totient is φ = 46626624.

The previous prime is 61611629. The next prime is 61611653. The reversal of 61611641 is 14611616.

It is an interprime number because it is at equal distance from previous prime (61611629) and next prime (61611653).

It is a cyclic number.

It is not a de Polignac number, because 61611641 - 2⁶ = 61611577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61611641.

It is not an unprimeable number, because it can be changed into a prime (61611691) 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, 12626 + ... + 16811.

It is an arithmetic number, because the mean of its divisors is an integer number (4945584).

Almost surely, 2^61611641 is an apocalyptic number.

It is an amenable number.

61611641 is a deficient number, since it is larger than the sum of its proper divisors (17517703).

61611641 is a wasteful number, since it uses less digits than its factorization.

61611641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29480.

The product of its digits is 864, while the sum is 26.

The square root of 61611641 is about 7849.3083134758. The cubic root of 61611641 is about 394.9610408619.

The spelling of 61611641 in words is "sixty-one million, six hundred eleven thousand, six hundred forty-one".