2761578961 has 4 divisors (see below), whose sum is σ = 2762440612. Its totient is φ = 2760717312.

The previous prime is 2761578947. The next prime is 2761579001. The reversal of 2761578961 is 1698751672.

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 2317844736 + 443734225 = 48144^2 + 21065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2761578961 - 2⁵ = 2761578929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2761578899 and 2761578908.

It is not an unprimeable number, because it can be changed into a prime (2761578901) 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, 426000 + ... + 432433.

It is an arithmetic number, because the mean of its divisors is an integer number (690610153).

Almost surely, 2^2761578961 is an apocalyptic number.

It is an amenable number.

2761578961 is a deficient number, since it is larger than the sum of its proper divisors (861651).

2761578961 is an equidigital number, since it uses as much as digits as its factorization.

2761578961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861650.

The product of its digits is 1270080, while the sum is 52.

The square root of 2761578961 is about 52550.7275021003. The cubic root of 2761578961 is about 1402.9832576834.

The spelling of 2761578961 in words is "two billion, seven hundred sixty-one million, five hundred seventy-eight thousand, nine hundred sixty-one".