61115516 has 24 divisors (see below), whose sum is σ = 133343616. Its totient is φ = 23811120.

The previous prime is 61115503. The next prime is 61115521. The reversal of 61115516 is 61551116.

61115516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98906 + ... + 99521.

It is an arithmetic number, because the mean of its divisors is an integer number (5555984).

Almost surely, 2^61115516 is an apocalyptic number.

It is an amenable number.

61115516 is an abundant number, since it is smaller than the sum of its proper divisors (72228100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61115516 is a wasteful number, since it uses less digits than its factorization.

61115516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198449 (or 198447 counting only the distinct ones).

The product of its digits is 900, while the sum is 26.

The square root of 61115516 is about 7817.6413322690. The cubic root of 61115516 is about 393.8980470915.

Subtracting 61115516 from its reverse (61551116), we obtain a square (435600 = 660²).

The spelling of 61115516 in words is "sixty-one million, one hundred fifteen thousand, five hundred sixteen".