161191242 has 32 divisors (see below), whose sum is σ = 358617600. Its totient is φ = 53668224.

The previous prime is 161191237. The next prime is 161191249. The reversal of 161191242 is 242191161.

161191242 is a `hidden beast` number, since 1 + 611 + 9 + 1 + 2 + 42 = 666.

161191242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161191249) 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, 90759 + ... + 92517.

It is an arithmetic number, because the mean of its divisors is an integer number (11206800).

Almost surely, 2^161191242 is an apocalyptic number.

161191242 is an abundant number, since it is smaller than the sum of its proper divisors (197426358).

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

161191242 is a wasteful number, since it uses less digits than its factorization.

161191242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467 (or 3461 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 161191242 is about 12696.1112944082. Note that the first 3 decimals coincide. The cubic root of 161191242 is about 544.2274968511.

The spelling of 161191242 in words is "one hundred sixty-one million, one hundred ninety-one thousand, two hundred forty-two".