61331655 has 32 divisors (see below), whose sum is σ = 122347008. Its totient is φ = 25488000.

The previous prime is 61331623. The next prime is 61331693. The reversal of 61331655 is 55613316.

It is not a de Polignac number, because 61331655 - 2⁵ = 61331623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25396 + ... + 27705.

It is an arithmetic number, because the mean of its divisors is an integer number (3823344).

Almost surely, 2^61331655 is an apocalyptic number.

61331655 is a deficient number, since it is larger than the sum of its proper divisors (61015353).

61331655 is a wasteful number, since it uses less digits than its factorization.

61331655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53127.

The product of its digits is 8100, while the sum is 30.

The square root of 61331655 is about 7831.4529303316. The cubic root of 61331655 is about 394.3618494581.

The spelling of 61331655 in words is "sixty-one million, three hundred thirty-one thousand, six hundred fifty-five".