139579891 has 4 divisors (see below), whose sum is σ = 152268984. Its totient is φ = 126890800.

The previous prime is 139579883. The next prime is 139579897. The reversal of 139579891 is 198975931.

It is a happy number.

139579891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139579891 - 2³ = 139579883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139579897) 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, 6344530 + ... + 6344551.

It is an arithmetic number, because the mean of its divisors is an integer number (38067246).

Almost surely, 2^139579891 is an apocalyptic number.

139579891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139579891 is a deficient number, since it is larger than the sum of its proper divisors (12689093).

139579891 is a wasteful number, since it uses less digits than its factorization.

139579891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12689092.

The product of its digits is 612360, while the sum is 52.

The square root of 139579891 is about 11814.3933826498. The cubic root of 139579891 is about 518.7295056306.

The spelling of 139579891 in words is "one hundred thirty-nine million, five hundred seventy-nine thousand, eight hundred ninety-one".