120311099981 has 2 divisors, whose sum is σ = 120311099982. Its totient is φ = 120311099980.

The previous prime is 120311099929. The next prime is 120311099999. The reversal of 120311099981 is 189990113021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86980755625 + 33330344356 = 294925^2 + 182566^2 .

It is a cyclic number.

It is not a de Polignac number, because 120311099981 - 2⁶ = 120311099917 is a prime.

It is a super-2 number, since 2×120311099981² (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 (120311090981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60155549990 + 60155549991.

It is an arithmetic number, because the mean of its divisors is an integer number (60155549991).

Almost surely, 2^120311099981 is an apocalyptic number.

It is an amenable number.

120311099981 is a deficient number, since it is larger than the sum of its proper divisors (1).

120311099981 is an equidigital number, since it uses as much as digits as its factorization.

120311099981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 44.

The spelling of 120311099981 in words is "one hundred twenty billion, three hundred eleven million, ninety-nine thousand, nine hundred eighty-one".