1992308531581 has 2 divisors, whose sum is σ = 1992308531582. Its totient is φ = 1992308531580.

The previous prime is 1992308531579. The next prime is 1992308531767. The reversal of 1992308531581 is 1851358032991.

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., 1962616072356 + 29692459225 = 1400934^2 + 172315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992308531581 - 2¹ = 1992308531579 is a prime.

It is a super-2 number, since 2×1992308531581² (a number of 25 digits) contains 22 as substring.

Together with 1992308531579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1992308531561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996154265790 + 996154265791.

It is an arithmetic number, because the mean of its divisors is an integer number (996154265791).

Almost surely, 2^{1992308531581} is an apocalyptic number.

It is an amenable number.

1992308531581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992308531581 is an equidigital number, since it uses as much as digits as its factorization.

1992308531581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 1992308531581 in words is "one trillion, nine hundred ninety-two billion, three hundred eight million, five hundred thirty-one thousand, five hundred eighty-one".