2309649961 has 4 divisors (see below), whose sum is σ = 2309814532. Its totient is φ = 2309485392.

The previous prime is 2309649911. The next prime is 2309649967. The reversal of 2309649961 is 1699469032.

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 1349827600 + 959822361 = 36740^2 + 30981^2 .

It is a cyclic number.

It is not a de Polignac number, because 2309649961 - 2¹¹ = 2309647913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2309649967) 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, 59046 + ... + 90031.

It is an arithmetic number, because the mean of its divisors is an integer number (577453633).

Almost surely, 2^2309649961 is an apocalyptic number.

It is an amenable number.

2309649961 is a deficient number, since it is larger than the sum of its proper divisors (164571).

2309649961 is a wasteful number, since it uses less digits than its factorization.

2309649961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164570.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 2309649961 is about 48058.8177237019. The cubic root of 2309649961 is about 1321.8496340171.

The spelling of 2309649961 in words is "two billion, three hundred nine million, six hundred forty-nine thousand, nine hundred sixty-one".