122171139 has 8 divisors (see below), whose sum is σ = 180994320. Its totient is φ = 81447408.

The previous prime is 122171117. The next prime is 122171141. The reversal of 122171139 is 931171221.

It is not a de Polignac number, because 122171139 - 2⁷ = 122171011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4524857 = 122171139 / (1 + 2 + 2 + 1 + 7 + 1 + 1 + 3 + 9).

It is not an unprimeable number, because it can be changed into a prime (122171149) 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, 2262402 + ... + 2262455.

It is an arithmetic number, because the mean of its divisors is an integer number (22624290).

Almost surely, 2^122171139 is an apocalyptic number.

122171139 is a deficient number, since it is larger than the sum of its proper divisors (58823181).

122171139 is an equidigital number, since it uses as much as digits as its factorization.

122171139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524866 (or 4524860 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 122171139 is about 11053.1054007460. The cubic root of 122171139 is about 496.1993689395.

The spelling of 122171139 in words is "one hundred twenty-two million, one hundred seventy-one thousand, one hundred thirty-nine".