120961599 has 16 divisors (see below), whose sum is σ = 178573440. Its totient is φ = 72214560.

The previous prime is 120961559. The next prime is 120961609. The reversal of 120961599 is 995169021.

It is a happy number.

It is not a de Polignac number, because 120961599 - 2⁸ = 120961343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120961599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120961549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25144 + ... + 29565.

It is an arithmetic number, because the mean of its divisors is an integer number (11160840).

Almost surely, 2^120961599 is an apocalyptic number.

120961599 is a deficient number, since it is larger than the sum of its proper divisors (57611841).

120961599 is a wasteful number, since it uses less digits than its factorization.

120961599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54790.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 120961599 is about 10998.2543614885. The cubic root of 120961599 is about 494.5564151788.

It can be divided in two parts, 12096 and 1599, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 120961599 in words is "one hundred twenty million, nine hundred sixty-one thousand, five hundred ninety-nine".