123564861 has 12 divisors (see below), whose sum is σ = 203980192. Its totient is φ = 70608456.

The previous prime is 123564851. The next prime is 123564869. The reversal of 123564861 is 168465321.

It is a happy number.

123564861 is a `hidden beast` number, since 1 + 2 + 3 + 5 + 648 + 6 + 1 = 666.

It is not a de Polignac number, because 123564861 - 2¹⁵ = 123532093 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 (123564869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 980611 + ... + 980736.

Almost surely, 2^123564861 is an apocalyptic number.

It is an amenable number.

123564861 is a deficient number, since it is larger than the sum of its proper divisors (80415331).

123564861 is a wasteful number, since it uses less digits than its factorization.

123564861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961360 (or 1961357 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 123564861 is about 11115.9732367436. The cubic root of 123564861 is about 498.0791111557.

The spelling of 123564861 in words is "one hundred twenty-three million, five hundred sixty-four thousand, eight hundred sixty-one".