31841521121 has 2 divisors, whose sum is σ = 31841521122. Its totient is φ = 31841521120.

The previous prime is 31841521111. The next prime is 31841521273. The reversal of 31841521121 is 12112514813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20609760721 + 11231760400 = 143561^2 + 105980^2 .

It is a cyclic number.

It is not a de Polignac number, because 31841521121 - 2³⁴ = 14661651937 is a prime.

It is not a weakly prime, because it can be changed into another prime (31841521111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15920760560 + 15920760561.

It is an arithmetic number, because the mean of its divisors is an integer number (15920760561).

Almost surely, 2^31841521121 is an apocalyptic number.

It is an amenable number.

31841521121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31841521121 is an equidigital number, since it uses as much as digits as its factorization.

31841521121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 29.

The spelling of 31841521121 in words is "thirty-one billion, eight hundred forty-one million, five hundred twenty-one thousand, one hundred twenty-one".