2320642561 has 4 divisors (see below), whose sum is σ = 2322608724. Its totient is φ = 2318676400.

The previous prime is 2320642549. The next prime is 2320642603. The reversal of 2320642561 is 1652460232.

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 1492354161 + 828288400 = 38631^2 + 28780^2 .

It is a cyclic number.

It is not a de Polignac number, because 2320642561 - 2⁵ = 2320642529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2320612561) 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, 981310 + ... + 983671.

It is an arithmetic number, because the mean of its divisors is an integer number (580652181).

Almost surely, 2^2320642561 is an apocalyptic number.

It is an amenable number.

2320642561 is a deficient number, since it is larger than the sum of its proper divisors (1966163).

2320642561 is a wasteful number, since it uses less digits than its factorization.

2320642561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966162.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2320642561 is about 48173.0480766995. The cubic root of 2320642561 is about 1323.9433961206.

The spelling of 2320642561 in words is "two billion, three hundred twenty million, six hundred forty-two thousand, five hundred sixty-one".