139223771 has 2 divisors, whose sum is σ = 139223772. Its totient is φ = 139223770.

The previous prime is 139223713. The next prime is 139223803. The reversal of 139223771 is 177322931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139223771 is a prime.

It is a super-2 number, since 2×139223771² = 38766516822920882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139223701) 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 as a sum of consecutive naturals, namely, 69611885 + 69611886.

It is an arithmetic number, because the mean of its divisors is an integer number (69611886).

Almost surely, 2^139223771 is an apocalyptic number.

139223771 is a deficient number, since it is larger than the sum of its proper divisors (1).

139223771 is an equidigital number, since it uses as much as digits as its factorization.

139223771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 35.

The square root of 139223771 is about 11799.3123104696. The cubic root of 139223771 is about 518.2879728803.

The spelling of 139223771 in words is "one hundred thirty-nine million, two hundred twenty-three thousand, seven hundred seventy-one".