61491655 has 8 divisors (see below), whose sum is σ = 74052432. Its totient is φ = 49018368.

The previous prime is 61491653. The next prime is 61491659. The reversal of 61491655 is 55619416.

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 61491655 - 2¹ = 61491653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61491653) 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, 20314 + ... + 23143.

It is an arithmetic number, because the mean of its divisors is an integer number (9256554).

Almost surely, 2^61491655 is an apocalyptic number.

61491655 is a deficient number, since it is larger than the sum of its proper divisors (12560777).

61491655 is a wasteful number, since it uses less digits than its factorization.

61491655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43745.

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

The square root of 61491655 is about 7841.6614948619. The cubic root of 61491655 is about 394.7044844104.

The spelling of 61491655 in words is "sixty-one million, four hundred ninety-one thousand, six hundred fifty-five".