40112999981 has 2 divisors, whose sum is σ = 40112999982. Its totient is φ = 40112999980.

The previous prime is 40112999959. The next prime is 40113000007. The reversal of 40112999981 is 18999921104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31453022500 + 8659977481 = 177350^2 + 93059^2 .

It is a cyclic number.

It is not a de Polignac number, because 40112999981 - 2¹⁸ = 40112737837 is a prime.

It is a super-2 number, since 2×40112999981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40112999581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20056499990 + 20056499991.

It is an arithmetic number, because the mean of its divisors is an integer number (20056499991).

Almost surely, 2^40112999981 is an apocalyptic number.

It is an amenable number.

40112999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

40112999981 is an equidigital number, since it uses as much as digits as its factorization.

40112999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 53.

The spelling of 40112999981 in words is "forty billion, one hundred twelve million, nine hundred ninety-nine thousand, nine hundred eighty-one".