61311655 has 16 divisors (see below), whose sum is σ = 76982400. Its totient is φ = 46816000.

The previous prime is 61311637. The next prime is 61311659. The reversal of 61311655 is 55611316.

It is not a de Polignac number, because 61311655 - 2⁵ = 61311623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61311659) 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, 10530 + ... + 15280.

It is an arithmetic number, because the mean of its divisors is an integer number (4811400).

Almost surely, 2^61311655 is an apocalyptic number.

61311655 is a deficient number, since it is larger than the sum of its proper divisors (15670745).

61311655 is a wasteful number, since it uses less digits than its factorization.

61311655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874.

The product of its digits is 2700, while the sum is 28.

The square root of 61311655 is about 7830.1759239496. The cubic root of 61311655 is about 394.3189782063.

The spelling of 61311655 in words is "sixty-one million, three hundred eleven thousand, six hundred fifty-five".