139373291 has 4 divisors (see below), whose sum is σ = 139437672. Its totient is φ = 139308912.

The previous prime is 139373263. The next prime is 139373321. The reversal of 139373291 is 192373931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192373931 = 61 ⋅3153671.

It is a cyclic number.

It is not a de Polignac number, because 139373291 - 2¹⁰ = 139372267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139373891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28826 + ... + 33311.

It is an arithmetic number, because the mean of its divisors is an integer number (34859418).

Almost surely, 2^139373291 is an apocalyptic number.

139373291 is a deficient number, since it is larger than the sum of its proper divisors (64381).

139373291 is an equidigital number, since it uses as much as digits as its factorization.

139373291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64380.

The product of its digits is 30618, while the sum is 38.

The square root of 139373291 is about 11805.6465727210. The cubic root of 139373291 is about 518.4734457390.

The spelling of 139373291 in words is "one hundred thirty-nine million, three hundred seventy-three thousand, two hundred ninety-one".