2139434691 has 8 divisors (see below), whose sum is σ = 2853261840. Its totient is φ = 1425948672.

The previous prime is 2139434681. The next prime is 2139434699. The reversal of 2139434691 is 1964349312.

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

It is not a de Polignac number, because 2139434691 - 2⁹ = 2139434179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139434699) 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, 70270 + ... + 96003.

It is an arithmetic number, because the mean of its divisors is an integer number (356657730).

Almost surely, 2^2139434691 is an apocalyptic number.

2139434691 is a deficient number, since it is larger than the sum of its proper divisors (713827149).

2139434691 is a wasteful number, since it uses less digits than its factorization.

2139434691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170565.

The product of its digits is 139968, while the sum is 42.

The square root of 2139434691 is about 46254.0235114741. The cubic root of 2139434691 is about 1288.5452605263.

The spelling of 2139434691 in words is "two billion, one hundred thirty-nine million, four hundred thirty-four thousand, six hundred ninety-one".