191942945 has 8 divisors (see below), whose sum is σ = 234677736. Its totient is φ = 150656896.

The previous prime is 191942941. The next prime is 191942969. The reversal of 191942945 is 549249191.

It can be written as a sum of positive squares in 4 ways, for example, as 3265249 + 188677696 = 1807^2 + 13736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191942945 - 2² = 191942941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191942896 and 191942905.

It is not an unprimeable number, because it can be changed into a prime (191942941) 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, 361892 + ... + 362421.

It is an arithmetic number, because the mean of its divisors is an integer number (29334717).

Almost surely, 2^191942945 is an apocalyptic number.

It is an amenable number.

191942945 is a deficient number, since it is larger than the sum of its proper divisors (42734791).

191942945 is an equidigital number, since it uses as much as digits as its factorization.

191942945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724371.

The product of its digits is 116640, while the sum is 44.

The square root of 191942945 is about 13854.3475126041. The cubic root of 191942945 is about 576.8426783303.

The spelling of 191942945 in words is "one hundred ninety-one million, nine hundred forty-two thousand, nine hundred forty-five".