123130031281 has 2 divisors, whose sum is σ = 123130031282. Its totient is φ = 123130031280.

The previous prime is 123130031279. The next prime is 123130031333. The reversal of 123130031281 is 182130031321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123116774400 + 13256881 = 350880^2 + 3641^2 .

It is a cyclic number.

It is not a de Polignac number, because 123130031281 - 2¹ = 123130031279 is a prime.

It is a super-2 number, since 2×123130031281² (a number of 23 digits) contains 22 as substring.

Together with 123130031279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123130031201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565015640 + 61565015641.

It is an arithmetic number, because the mean of its divisors is an integer number (61565015641).

Almost surely, 2^123130031281 is an apocalyptic number.

It is an amenable number.

123130031281 is a deficient number, since it is larger than the sum of its proper divisors (1).

123130031281 is an equidigital number, since it uses as much as digits as its factorization.

123130031281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 123130031281 in words is "one hundred twenty-three billion, one hundred thirty million, thirty-one thousand, two hundred eighty-one".