31496355881 has 2 divisors, whose sum is σ = 31496355882. Its totient is φ = 31496355880.

The previous prime is 31496355833. The next prime is 31496355887. The reversal of 31496355881 is 18855369413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31308117481 + 188238400 = 176941^2 + 13720^2 .

It is a cyclic number.

It is not a de Polignac number, because 31496355881 - 2¹⁸ = 31496093737 is a prime.

It is a super-2 number, since 2×31496355881² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31496355887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15748177940 + 15748177941.

It is an arithmetic number, because the mean of its divisors is an integer number (15748177941).

Almost surely, 2^31496355881 is an apocalyptic number.

It is an amenable number.

31496355881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31496355881 is an equidigital number, since it uses as much as digits as its factorization.

31496355881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 53.

The spelling of 31496355881 in words is "thirty-one billion, four hundred ninety-six million, three hundred fifty-five thousand, eight hundred eighty-one".