139342051991 has 4 divisors (see below), whose sum is σ = 142582564872. Its totient is φ = 136101539112.

The previous prime is 139342051969. The next prime is 139342052011. The reversal of 139342051991 is 199150243931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199150243931 = 107 ⋅1861217233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139342051991 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 (139342051091) 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, 1620256376 + ... + 1620256461.

It is an arithmetic number, because the mean of its divisors is an integer number (35645641218).

Almost surely, 2^139342051991 is an apocalyptic number.

139342051991 is a deficient number, since it is larger than the sum of its proper divisors (3240512881).

139342051991 is an equidigital number, since it uses as much as digits as its factorization.

139342051991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240512880.

The product of its (nonzero) digits is 262440, while the sum is 47.

The spelling of 139342051991 in words is "one hundred thirty-nine billion, three hundred forty-two million, fifty-one thousand, nine hundred ninety-one".