345139691 has 4 divisors (see below), whose sum is σ = 371688912. Its totient is φ = 318590472.

The previous prime is 345139687. The next prime is 345139723. The reversal of 345139691 is 196931543.

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 345139691 - 2² = 345139687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345139601) 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, 13274591 + ... + 13274616.

It is an arithmetic number, because the mean of its divisors is an integer number (92922228).

Almost surely, 2^345139691 is an apocalyptic number.

345139691 is a deficient number, since it is larger than the sum of its proper divisors (26549221).

345139691 is a wasteful number, since it uses less digits than its factorization.

345139691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26549220.

The product of its digits is 87480, while the sum is 41.

The square root of 345139691 is about 18577.9355957544. The cubic root of 345139691 is about 701.4525558547.

The spelling of 345139691 in words is "three hundred forty-five million, one hundred thirty-nine thousand, six hundred ninety-one".