2809123961 has 8 divisors (see below), whose sum is σ = 3249107904. Its totient is φ = 2378810160.

The previous prime is 2809123943. The next prime is 2809123973. The reversal of 2809123961 is 1693219082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2809123961 - 2²² = 2804929657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2809123991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2416910 + ... + 2418071.

It is an arithmetic number, because the mean of its divisors is an integer number (406138488).

Almost surely, 2^2809123961 is an apocalyptic number.

It is an amenable number.

2809123961 is a deficient number, since it is larger than the sum of its proper divisors (439983943).

2809123961 is an equidigital number, since it uses as much as digits as its factorization.

2809123961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835071.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 2809123961 is about 53001.1694304946. The cubic root of 2809123961 is about 1410.9890217459.

The spelling of 2809123961 in words is "two billion, eight hundred nine million, one hundred twenty-three thousand, nine hundred sixty-one".