31012033121 has 2 divisors, whose sum is σ = 31012033122. Its totient is φ = 31012033120.

The previous prime is 31012033103. The next prime is 31012033159. The reversal of 31012033121 is 12133021013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30777790096 + 234243025 = 175436^2 + 15305^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012033121 - 2³⁴ = 13832163937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31012033121.

It is not a weakly prime, because it can be changed into another prime (31012035121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506016560 + 15506016561.

It is an arithmetic number, because the mean of its divisors is an integer number (15506016561).

Almost surely, 2^31012033121 is an apocalyptic number.

It is an amenable number.

31012033121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012033121 is an equidigital number, since it uses as much as digits as its factorization.

31012033121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31012033121 its reverse (12133021013), we get a palindrome (43145054134).

The spelling of 31012033121 in words is "thirty-one billion, twelve million, thirty-three thousand, one hundred twenty-one".