10111099981 has 2 divisors, whose sum is σ = 10111099982. Its totient is φ = 10111099980.

The previous prime is 10111099969. The next prime is 10111099991. The reversal of 10111099981 is 18999011101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7459776900 + 2651323081 = 86370^2 + 51491^2 .

It is a cyclic number.

It is not a de Polignac number, because 10111099981 - 2⁵ = 10111099949 is a prime.

It is a super-2 number, since 2×10111099981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10111099931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5055549990 + 5055549991.

It is an arithmetic number, because the mean of its divisors is an integer number (5055549991).

Almost surely, 2^10111099981 is an apocalyptic number.

It is an amenable number.

10111099981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10111099981 is an equidigital number, since it uses as much as digits as its factorization.

10111099981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 40.

The spelling of 10111099981 in words is "ten billion, one hundred eleven million, ninety-nine thousand, nine hundred eighty-one".