139101391 has 16 divisors (see below), whose sum is σ = 164965248. Its totient is φ = 115624800.

The previous prime is 139101373. The next prime is 139101461. The reversal of 139101391 is 193101931.

It is a cyclic number.

It is not a de Polignac number, because 139101391 - 2⁵ = 139101359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139101301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10756 + ... + 19846.

It is an arithmetic number, because the mean of its divisors is an integer number (10310328).

Almost surely, 2^139101391 is an apocalyptic number.

139101391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139101391 is a deficient number, since it is larger than the sum of its proper divisors (25863857).

139101391 is a wasteful number, since it uses less digits than its factorization.

139101391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9222.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 139101391 is about 11794.1252748985. The cubic root of 139101391 is about 518.1360671257.

The spelling of 139101391 in words is "one hundred thirty-nine million, one hundred one thousand, three hundred ninety-one".