100401439981 has 2 divisors, whose sum is σ = 100401439982. Its totient is φ = 100401439980.

The previous prime is 100401439889. The next prime is 100401440039. The reversal of 100401439981 is 189934104001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70813999881 + 29587440100 = 266109^2 + 172010^2 .

It is a cyclic number.

It is not a de Polignac number, because 100401439981 - 2³³ = 91811505389 is a prime.

It is a super-2 number, since 2×100401439981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100401434981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50200719990 + 50200719991.

It is an arithmetic number, because the mean of its divisors is an integer number (50200719991).

Almost surely, 2^100401439981 is an apocalyptic number.

It is an amenable number.

100401439981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100401439981 is an equidigital number, since it uses as much as digits as its factorization.

100401439981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 100401439981 in words is "one hundred billion, four hundred one million, four hundred thirty-nine thousand, nine hundred eighty-one".