139875491 has 4 divisors (see below), whose sum is σ = 159857712. Its totient is φ = 119893272.

The previous prime is 139875479. The next prime is 139875509. The reversal of 139875491 is 194578931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139875491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139875401) 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, 9991100 + ... + 9991113.

It is an arithmetic number, because the mean of its divisors is an integer number (39964428).

Almost surely, 2^139875491 is an apocalyptic number.

139875491 is a deficient number, since it is larger than the sum of its proper divisors (19982221).

139875491 is an equidigital number, since it uses as much as digits as its factorization.

139875491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19982220.

The product of its digits is 272160, while the sum is 47.

The square root of 139875491 is about 11826.8969303026. The cubic root of 139875491 is about 519.0954330419.

The spelling of 139875491 in words is "one hundred thirty-nine million, eight hundred seventy-five thousand, four hundred ninety-one".