861546601 has 4 divisors (see below), whose sum is σ = 865920132. Its totient is φ = 857173072.

The previous prime is 861546599. The next prime is 861546607. The reversal of 861546601 is 106645168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 404613225 + 456933376 = 20115^2 + 21376^2 .

It is a cyclic number.

It is not a de Polignac number, because 861546601 - 2¹ = 861546599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861546607) 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, 2186470 + ... + 2186863.

It is an arithmetic number, because the mean of its divisors is an integer number (216480033).

Almost surely, 2^861546601 is an apocalyptic number.

It is an amenable number.

861546601 is a deficient number, since it is larger than the sum of its proper divisors (4373531).

861546601 is a wasteful number, since it uses less digits than its factorization.

861546601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373530.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 861546601 is about 29352.1140805905. The cubic root of 861546601 is about 951.5382653806.

The spelling of 861546601 in words is "eight hundred sixty-one million, five hundred forty-six thousand, six hundred one".