1902792901981 has 2 divisors, whose sum is σ = 1902792901982. Its totient is φ = 1902792901980.

The previous prime is 1902792901973. The next prime is 1902792901987. The reversal of 1902792901981 is 1891092972091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1887694636356 + 15098265625 = 1373934^2 + 122875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1902792901981 - 2³ = 1902792901973 is a prime.

It is a super-2 number, since 2×1902792901981² (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 (1902792901987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 951396450990 + 951396450991.

It is an arithmetic number, because the mean of its divisors is an integer number (951396450991).

Almost surely, 2^{1902792901981} is an apocalyptic number.

It is an amenable number.

1902792901981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1902792901981 is an equidigital number, since it uses as much as digits as its factorization.

1902792901981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 58.

The spelling of 1902792901981 in words is "one trillion, nine hundred two billion, seven hundred ninety-two million, nine hundred one thousand, nine hundred eighty-one".