31288428121 has 2 divisors, whose sum is σ = 31288428122. Its totient is φ = 31288428120.

The previous prime is 31288428043. The next prime is 31288428179. The reversal of 31288428121 is 12182488213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21922059721 + 9366368400 = 148061^2 + 96780^2 .

It is a cyclic number.

It is not a de Polignac number, because 31288428121 - 2¹⁷ = 31288297049 is a prime.

It is not a weakly prime, because it can be changed into another prime (31288428221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15644214060 + 15644214061.

It is an arithmetic number, because the mean of its divisors is an integer number (15644214061).

Almost surely, 2^31288428121 is an apocalyptic number.

It is an amenable number.

31288428121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31288428121 is an equidigital number, since it uses as much as digits as its factorization.

31288428121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49152, while the sum is 40.

The spelling of 31288428121 in words is "thirty-one billion, two hundred eighty-eight million, four hundred twenty-eight thousand, one hundred twenty-one".