31095121 has 2 divisors, whose sum is σ = 31095122. Its totient is φ = 31095120.

The previous prime is 31095083. The next prime is 31095137. The reversal of 31095121 is 12159013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29376400 + 1718721 = 5420^2 + 1311^2 .

It is an emirp because it is prime and its reverse (12159013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31095121 - 2⁷ = 31094993 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31095092 and 31095101.

It is not a weakly prime, because it can be changed into another prime (31095161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15547560 + 15547561.

It is an arithmetic number, because the mean of its divisors is an integer number (15547561).

Almost surely, 2^31095121 is an apocalyptic number.

It is an amenable number.

31095121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31095121 is an equidigital number, since it uses as much as digits as its factorization.

31095121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 31095121 is about 5576.2999381310. The cubic root of 31095121 is about 314.4590396078.

The spelling of 31095121 in words is "thirty-one million, ninety-five thousand, one hundred twenty-one".