61191690 has 48 divisors (see below), whose sum is σ = 170841312. Its totient is φ = 13986336.

The previous prime is 61191679. The next prime is 61191701. The reversal of 61191690 is 9619116.

61191690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61191679) and next prime (61191701).

It is a super-2 number, since 2×61191690² = 7488845850112200, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 19344 + ... + 22283.

It is an arithmetic number, because the mean of its divisors is an integer number (3559194).

Almost surely, 2^61191690 is an apocalyptic number.

61191690 is an abundant number, since it is smaller than the sum of its proper divisors (109649622).

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

61191690 is a wasteful number, since it uses less digits than its factorization.

61191690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41651 (or 41644 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 61191690 is about 7822.5117449576. The cubic root of 61191690 is about 394.0616298416.

The spelling of 61191690 in words is "sixty-one million, one hundred ninety-one thousand, six hundred ninety".