139297771 has 2 divisors, whose sum is σ = 139297772. Its totient is φ = 139297770.

The previous prime is 139297751. The next prime is 139297783. The reversal of 139297771 is 177792931.

139297771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139297771 - 2²⁷ = 5080043 is a prime.

It is not a weakly prime, because it can be changed into another prime (139297751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69648885 + 69648886.

It is an arithmetic number, because the mean of its divisors is an integer number (69648886).

Almost surely, 2^139297771 is an apocalyptic number.

139297771 is a deficient number, since it is larger than the sum of its proper divisors (1).

139297771 is an equidigital number, since it uses as much as digits as its factorization.

139297771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 166698, while the sum is 46.

The square root of 139297771 is about 11802.4476698692. The cubic root of 139297771 is about 518.3797831523.

The spelling of 139297771 in words is "one hundred thirty-nine million, two hundred ninety-seven thousand, seven hundred seventy-one".