61655491 has 8 divisors (see below), whose sum is σ = 62507744. Its totient is φ = 60808320.

The previous prime is 61655467. The next prime is 61655501. The reversal of 61655491 is 19455616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61655491 is a prime.

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 61655491.

It is not an unprimeable number, because it can be changed into a prime (61655401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27451 + ... + 29611.

It is an arithmetic number, because the mean of its divisors is an integer number (7813468).

Almost surely, 2^61655491 is an apocalyptic number.

61655491 is a deficient number, since it is larger than the sum of its proper divisors (852253).

61655491 is a wasteful number, since it uses less digits than its factorization.

61655491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541.

The product of its digits is 32400, while the sum is 37.

The square root of 61655491 is about 7852.1010564052. The cubic root of 61655491 is about 395.0547186921.

The spelling of 61655491 in words is "sixty-one million, six hundred fifty-five thousand, four hundred ninety-one".