139658971 has 4 divisors (see below), whose sum is σ = 139682872. Its totient is φ = 139635072.

The previous prime is 139658963. The next prime is 139658977. The reversal of 139658971 is 179856931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 139658971 - 2³ = 139658963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139658977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3316 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (34920718).

Almost surely, 2^139658971 is an apocalyptic number.

139658971 is a deficient number, since it is larger than the sum of its proper divisors (23901).

139658971 is a wasteful number, since it uses less digits than its factorization.

139658971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23900.

The product of its digits is 408240, while the sum is 49.

The square root of 139658971 is about 11817.7396738970. The cubic root of 139658971 is about 518.8274504575.

The spelling of 139658971 in words is "one hundred thirty-nine million, six hundred fifty-eight thousand, nine hundred seventy-one".