139221331 has 2 divisors, whose sum is σ = 139221332. Its totient is φ = 139221330.

The previous prime is 139221263. The next prime is 139221349. The reversal of 139221331 is 133122931.

It is a strong prime.

It is an emirp because it is prime and its reverse (133122931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139221331 - 2⁹ = 139220819 is a prime.

It is a super-2 number, since 2×139221331² = 38765158010823122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139221296 and 139221305.

It is not a weakly prime, because it can be changed into another prime (139221391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69610665 + 69610666.

It is an arithmetic number, because the mean of its divisors is an integer number (69610666).

Almost surely, 2^139221331 is an apocalyptic number.

139221331 is a deficient number, since it is larger than the sum of its proper divisors (1).

139221331 is an equidigital number, since it uses as much as digits as its factorization.

139221331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 139221331 is about 11799.2089141603. The cubic root of 139221331 is about 518.2849450687.

The spelling of 139221331 in words is "one hundred thirty-nine million, two hundred twenty-one thousand, three hundred thirty-one".