31080121 has 2 divisors, whose sum is σ = 31080122. Its totient is φ = 31080120.

The previous prime is 31080047. The next prime is 31080139. The reversal of 31080121 is 12108013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26832400 + 4247721 = 5180^2 + 2061^2 .

It is a cyclic number.

It is not a de Polignac number, because 31080121 - 2¹⁷ = 30949049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31080095 and 31080104.

It is not a weakly prime, because it can be changed into another prime (31050121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15540060 + 15540061.

It is an arithmetic number, because the mean of its divisors is an integer number (15540061).

Almost surely, 2^31080121 is an apocalyptic number.

It is an amenable number.

31080121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31080121 is an equidigital number, since it uses as much as digits as its factorization.

31080121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 31080121 is about 5574.9547980230. The cubic root of 31080121 is about 314.4084674269.

Adding to 31080121 its reverse (12108013), we get a palindrome (43188134).

It can be divided in two parts, 3108012 and 1, that added together give a palindrome (3108013).

The spelling of 31080121 in words is "thirty-one million, eighty thousand, one hundred twenty-one".