191661442 has 24 divisors (see below), whose sum is σ = 338473296. Its totient is φ = 81147528.

The previous prime is 191661439. The next prime is 191661469. The reversal of 191661442 is 244166191.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 191661398 and 191661407.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3648 + ... + 19915.

It is an arithmetic number, because the mean of its divisors is an integer number (14103054).

Almost surely, 2^191661442 is an apocalyptic number.

191661442 is a deficient number, since it is larger than the sum of its proper divisors (146811854).

191661442 is a wasteful number, since it uses less digits than its factorization.

191661442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23662 (or 23655 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 191661442 is about 13844.1844107914. The cubic root of 191661442 is about 576.5605417251.

The spelling of 191661442 in words is "one hundred ninety-one million, six hundred sixty-one thousand, four hundred forty-two".