120564661 has 4 divisors (see below), whose sum is σ = 137788192. Its totient is φ = 103341132.

The previous prime is 120564659. The next prime is 120564667. The reversal of 120564661 is 166465021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166465021 = 1493 ⋅111497.

It is a cyclic number.

It is not a de Polignac number, because 120564661 - 2¹ = 120564659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120564667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8611755 + ... + 8611768.

It is an arithmetic number, because the mean of its divisors is an integer number (34447048).

Almost surely, 2^120564661 is an apocalyptic number.

It is an amenable number.

120564661 is a deficient number, since it is larger than the sum of its proper divisors (17223531).

120564661 is an equidigital number, since it uses as much as digits as its factorization.

120564661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17223530.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 120564661 is about 10980.1940328940. The cubic root of 120564661 is about 494.0148566508.

The spelling of 120564661 in words is "one hundred twenty million, five hundred sixty-four thousand, six hundred sixty-one".