139622381 has 2 divisors, whose sum is σ = 139622382. Its totient is φ = 139622380.

The previous prime is 139622363. The next prime is 139622389. The reversal of 139622381 is 183226931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109537156 + 30085225 = 10466^2 + 5485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139622381 is a prime.

It is a super-2 number, since 2×139622381² = 38988818552218322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139622389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69811190 + 69811191.

It is an arithmetic number, because the mean of its divisors is an integer number (69811191).

Almost surely, 2^139622381 is an apocalyptic number.

It is an amenable number.

139622381 is a deficient number, since it is larger than the sum of its proper divisors (1).

139622381 is an equidigital number, since it uses as much as digits as its factorization.

139622381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 139622381 is about 11816.1914761060. The cubic root of 139622381 is about 518.7821363746.

The spelling of 139622381 in words is "one hundred thirty-nine million, six hundred twenty-two thousand, three hundred eighty-one".