120911661 has 24 divisors (see below), whose sum is σ = 190366176. Its totient is φ = 73504800.

The previous prime is 120911653. The next prime is 120911663. The reversal of 120911661 is 166119021.

It is not a de Polignac number, because 120911661 - 2³ = 120911653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120911663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3486 + ... + 15936.

It is an arithmetic number, because the mean of its divisors is an integer number (7931924).

Almost surely, 2^120911661 is an apocalyptic number.

It is an amenable number.

120911661 is a deficient number, since it is larger than the sum of its proper divisors (69454515).

120911661 is a wasteful number, since it uses less digits than its factorization.

120911661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12553 (or 12550 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 120911661 is about 10995.9838577546. The cubic root of 120911661 is about 494.4883479632.

The spelling of 120911661 in words is "one hundred twenty million, nine hundred eleven thousand, six hundred sixty-one".