31012121953 has 2 divisors, whose sum is σ = 31012121954. Its totient is φ = 31012121952.

The previous prime is 31012121947. The next prime is 31012122047. The reversal of 31012121953 is 35912121013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19804088529 + 11208033424 = 140727^2 + 105868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31012121953 is a prime.

It is not a weakly prime, because it can be changed into another prime (31012121053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506060976 + 15506060977.

It is an arithmetic number, because the mean of its divisors is an integer number (15506060977).

Almost surely, 2^31012121953 is an apocalyptic number.

It is an amenable number.

31012121953 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012121953 is an equidigital number, since it uses as much as digits as its factorization.

31012121953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

Adding to 31012121953 its reverse (35912121013), we get a palindrome (66924242966).

The spelling of 31012121953 in words is "thirty-one billion, twelve million, one hundred twenty-one thousand, nine hundred fifty-three".