139223891 has 2 divisors, whose sum is σ = 139223892. Its totient is φ = 139223890.

The previous prime is 139223881. The next prime is 139223941. The reversal of 139223891 is 198322931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139223891 - 2⁶ = 139223827 is a prime.

It is not a weakly prime, because it can be changed into another prime (139223881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69611945 + 69611946.

It is an arithmetic number, because the mean of its divisors is an integer number (69611946).

Almost surely, 2^139223891 is an apocalyptic number.

139223891 is a deficient number, since it is larger than the sum of its proper divisors (1).

139223891 is an equidigital number, since it uses as much as digits as its factorization.

139223891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 139223891 is about 11799.3173955106. The cubic root of 139223891 is about 518.2881217882.

The spelling of 139223891 in words is "one hundred thirty-nine million, two hundred twenty-three thousand, eight hundred ninety-one".