191749013 has 2 divisors, whose sum is σ = 191749014. Its totient is φ = 191749012.

The previous prime is 191748989. The next prime is 191749039. The reversal of 191749013 is 310947191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191739409 + 9604 = 13847^2 + 98^2 .

It is an emirp because it is prime and its reverse (310947191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191749013 - 2²² = 187554709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191749093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95874506 + 95874507.

It is an arithmetic number, because the mean of its divisors is an integer number (95874507).

Almost surely, 2^191749013 is an apocalyptic number.

It is an amenable number.

191749013 is a deficient number, since it is larger than the sum of its proper divisors (1).

191749013 is an equidigital number, since it uses as much as digits as its factorization.

191749013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 191749013 is about 13847.3467855759. The cubic root of 191749013 is about 576.6483394148.

The spelling of 191749013 in words is "one hundred ninety-one million, seven hundred forty-nine thousand, thirteen".