1831361726981 has 2 divisors, whose sum is σ = 1831361726982. Its totient is φ = 1831361726980.

The previous prime is 1831361726903. The next prime is 1831361726993. The reversal of 1831361726981 is 1896271631381.

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., 1414993516225 + 416368210756 = 1189535^2 + 645266^2 .

It is a cyclic number.

It is not a de Polignac number, because 1831361726981 - 2¹⁴ = 1831361710597 is a prime.

It is a super-2 number, since 2×1831361726981² (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 (1831361726881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915680863490 + 915680863491.

It is an arithmetic number, because the mean of its divisors is an integer number (915680863491).

Almost surely, 2^{1831361726981} is an apocalyptic number.

It is an amenable number.

1831361726981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1831361726981 is an equidigital number, since it uses as much as digits as its factorization.

1831361726981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The spelling of 1831361726981 in words is "one trillion, eight hundred thirty-one billion, three hundred sixty-one million, seven hundred twenty-six thousand, nine hundred eighty-one".