120445991 has 2 divisors, whose sum is σ = 120445992. Its totient is φ = 120445990.

The previous prime is 120445957. The next prime is 120445993. The reversal of 120445991 is 199544021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120445991 is a prime.

It is a Sophie Germain prime.

Together with 120445993, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_6865613 and since 120445991 and 6865613 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120445993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60222995 + 60222996.

It is an arithmetic number, because the mean of its divisors is an integer number (60222996).

Almost surely, 2^120445991 is an apocalyptic number.

120445991 is a deficient number, since it is larger than the sum of its proper divisors (1).

120445991 is an equidigital number, since it uses as much as digits as its factorization.

120445991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 120445991 is about 10974.7888817963. The cubic root of 120445991 is about 493.8527196211.

The spelling of 120445991 in words is "one hundred twenty million, four hundred forty-five thousand, nine hundred ninety-one".