120897919991 has 2 divisors, whose sum is σ = 120897919992. Its totient is φ = 120897919990.

The previous prime is 120897919957. The next prime is 120897920023. The reversal of 120897919991 is 199919798021.

It is a strong prime.

It is an emirp because it is prime and its reverse (199919798021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120897919991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120897919921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60448959995 + 60448959996.

It is an arithmetic number, because the mean of its divisors is an integer number (60448959996).

Almost surely, 2^120897919991 is an apocalyptic number.

120897919991 is a deficient number, since it is larger than the sum of its proper divisors (1).

120897919991 is an equidigital number, since it uses as much as digits as its factorization.

120897919991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6613488, while the sum is 65.

The spelling of 120897919991 in words is "one hundred twenty billion, eight hundred ninety-seven million, nine hundred nineteen thousand, nine hundred ninety-one".