139622991 has 8 divisors (see below), whose sum is σ = 188786304. Its totient is φ = 91770840.

The previous prime is 139622957. The next prime is 139623007. The reversal of 139622991 is 199226931.

139622991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 139622991 - 2¹⁰ = 139621967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139622191) 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, 327541 + ... + 327966.

It is an arithmetic number, because the mean of its divisors is an integer number (23598288).

Almost surely, 2^139622991 is an apocalyptic number.

139622991 is a deficient number, since it is larger than the sum of its proper divisors (49163313).

139622991 is an equidigital number, since it uses as much as digits as its factorization.

139622991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655581.

The product of its digits is 52488, while the sum is 42.

The square root of 139622991 is about 11816.2172881172. The cubic root of 139622991 is about 518.7828918806.

The spelling of 139622991 in words is "one hundred thirty-nine million, six hundred twenty-two thousand, nine hundred ninety-one".