120561961 has 16 divisors (see below), whose sum is σ = 135072000. Its totient is φ = 106843968.

The previous prime is 120561953. The next prime is 120561967. The reversal of 120561961 is 169165021.

It is a cyclic number.

It is not a de Polignac number, because 120561961 - 2³ = 120561953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120561967) 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, 74220 + ... + 75826.

It is an arithmetic number, because the mean of its divisors is an integer number (8442000).

Almost surely, 2^120561961 is an apocalyptic number.

It is an amenable number.

120561961 is a deficient number, since it is larger than the sum of its proper divisors (14510039).

120561961 is a wasteful number, since it uses less digits than its factorization.

120561961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 120561961 is about 10980.0710835586. The cubic root of 120561961 is about 494.0111688646.

The spelling of 120561961 in words is "one hundred twenty million, five hundred sixty-one thousand, nine hundred sixty-one".