61191912 has 32 divisors (see below), whose sum is σ = 153190080. Its totient is φ = 20369280.

The previous prime is 61191901. The next prime is 61191917. The reversal of 61191912 is 21919116.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61191912.

It is not an unprimeable number, because it can be changed into a prime (61191917) 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, 23508 + ... + 25980.

It is an arithmetic number, because the mean of its divisors is an integer number (4787190).

Almost surely, 2^61191912 is an apocalyptic number.

It is an amenable number.

61191912 is an abundant number, since it is smaller than the sum of its proper divisors (91998168).

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

61191912 is a wasteful number, since it uses less digits than its factorization.

61191912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513 (or 3509 counting only the distinct ones).

The product of its digits is 972, while the sum is 30.

The square root of 61191912 is about 7822.5259347605. The cubic root of 61191912 is about 394.0621063854.

The spelling of 61191912 in words is "sixty-one million, one hundred ninety-one thousand, nine hundred twelve".