139217771 has 24 divisors (see below), whose sum is σ = 177809904. Its totient is φ = 107782080.

The previous prime is 139217753. The next prime is 139217773. The reversal of 139217771 is 177712931.

It is a de Polignac number, because none of the positive numbers 2^k-139217771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139217773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92501 + ... + 93993.

It is an arithmetic number, because the mean of its divisors is an integer number (7408746).

Almost surely, 2^139217771 is an apocalyptic number.

139217771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139217771 is a deficient number, since it is larger than the sum of its proper divisors (38592133).

139217771 is a wasteful number, since it uses less digits than its factorization.

139217771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691 (or 1684 counting only the distinct ones).

The product of its digits is 18522, while the sum is 38.

The square root of 139217771 is about 11799.0580556246. The cubic root of 139217771 is about 518.2805273785.

The spelling of 139217771 in words is "one hundred thirty-nine million, two hundred seventeen thousand, seven hundred seventy-one".