102281511023981 has 2 divisors, whose sum is σ = 102281511023982. Its totient is φ = 102281511023980.

The previous prime is 102281511023977. The next prime is 102281511024001. The reversal of 102281511023981 is 189320115182201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100493286833956 + 1788224190025 = 10024634^2 + 1337245^2 .

It is a cyclic number.

It is not a de Polignac number, because 102281511023981 - 2² = 102281511023977 is a prime.

It is a super-2 number, since 2×102281511023981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102281511023941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51140755511990 + 51140755511991.

It is an arithmetic number, because the mean of its divisors is an integer number (51140755511991).

Almost surely, 2^{102281511023981} is an apocalyptic number.

It is an amenable number.

102281511023981 is a deficient number, since it is larger than the sum of its proper divisors (1).

102281511023981 is an equidigital number, since it uses as much as digits as its factorization.

102281511023981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 102281511023981 in words is "one hundred two trillion, two hundred eighty-one billion, five hundred eleven million, twenty-three thousand, nine hundred eighty-one".