190609391 has 4 divisors (see below), whose sum is σ = 217839312. Its totient is φ = 163379472.

The previous prime is 190609361. The next prime is 190609409. The reversal of 190609391 is 193906091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 190609391 - 2⁶ = 190609327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190609301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13614950 + ... + 13614963.

It is an arithmetic number, because the mean of its divisors is an integer number (54459828).

Almost surely, 2^190609391 is an apocalyptic number.

190609391 is a deficient number, since it is larger than the sum of its proper divisors (27229921).

190609391 is an equidigital number, since it uses as much as digits as its factorization.

190609391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27229920.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 190609391 is about 13806.1359909281. The cubic root of 190609391 is about 575.5036705908.

The spelling of 190609391 in words is "one hundred ninety million, six hundred nine thousand, three hundred ninety-one".