1231422143981 has 2 divisors, whose sum is σ = 1231422143982. Its totient is φ = 1231422143980.

The previous prime is 1231422143971. The next prime is 1231422144023. The reversal of 1231422143981 is 1893412241321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692873112100 + 538549031881 = 832390^2 + 733859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231422143981 is a prime.

It is a super-2 number, since 2×1231422143981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231422143971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615711071990 + 615711071991.

It is an arithmetic number, because the mean of its divisors is an integer number (615711071991).

Almost surely, 2^{1231422143981} is an apocalyptic number.

It is an amenable number.

1231422143981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231422143981 is an equidigital number, since it uses as much as digits as its factorization.

1231422143981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The spelling of 1231422143981 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-two million, one hundred forty-three thousand, nine hundred eighty-one".