1231944021337 has 2 divisors, whose sum is σ = 1231944021338. Its totient is φ = 1231944021336.

The previous prime is 1231944021313. The next prime is 1231944021349. The reversal of 1231944021337 is 7331204491321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113539899536 + 118404121801 = 1055244^2 + 344099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231944021337 is a prime.

It is a super-2 number, since 2×1231944021337² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231944021337.

It is not a weakly prime, because it can be changed into another prime (1231944021037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615972010668 + 615972010669.

It is an arithmetic number, because the mean of its divisors is an integer number (615972010669).

Almost surely, 2^{1231944021337} is an apocalyptic number.

It is an amenable number.

1231944021337 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231944021337 is an equidigital number, since it uses as much as digits as its factorization.

1231944021337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 1231944021337 in words is "one trillion, two hundred thirty-one billion, nine hundred forty-four million, twenty-one thousand, three hundred thirty-seven".