31401121139 has 4 divisors (see below), whose sum is σ = 31443961056. Its totient is φ = 31358281224.

The previous prime is 31401121127. The next prime is 31401121159. The reversal of 31401121139 is 93112110413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93112110413 = 7 ⋅13301730059.

It is a cyclic number.

It is not a de Polignac number, because 31401121139 - 2²⁰ = 31400072563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31401121159) 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, 21418859 + ... + 21420324.

It is an arithmetic number, because the mean of its divisors is an integer number (7860990264).

Almost surely, 2^31401121139 is an apocalyptic number.

31401121139 is a deficient number, since it is larger than the sum of its proper divisors (42839917).

31401121139 is an equidigital number, since it uses as much as digits as its factorization.

31401121139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42839916.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 31401121139 in words is "thirty-one billion, four hundred one million, one hundred twenty-one thousand, one hundred thirty-nine".