139197771 has 20 divisors (see below), whose sum is σ = 216981072. Its totient is φ = 88762608.

The previous prime is 139197731. The next prime is 139197827. The reversal of 139197771 is 177791931.

It is not a de Polignac number, because 139197771 - 2¹⁰ = 139196747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139197731) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35496 + ... + 39221.

Almost surely, 2^139197771 is an apocalyptic number.

139197771 is a deficient number, since it is larger than the sum of its proper divisors (77783301).

139197771 is an equidigital number, since it uses as much as digits as its factorization.

139197771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74752 (or 74743 counting only the distinct ones).

The product of its digits is 83349, while the sum is 45.

The square root of 139197771 is about 11798.2104999021. The cubic root of 139197771 is about 518.2557074941.

The spelling of 139197771 in words is "one hundred thirty-nine million, one hundred ninety-seven thousand, seven hundred seventy-one".