2721277961 has 4 divisors (see below), whose sum is σ = 2794826052. Its totient is φ = 2647729872.

The previous prime is 2721277939. The next prime is 2721277969. The reversal of 2721277961 is 1697721272.

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 1329987961 + 1391290000 = 36469^2 + 37300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721277961 - 2¹⁴ = 2721261577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2721277969) 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, 36773990 + ... + 36774063.

It is an arithmetic number, because the mean of its divisors is an integer number (698706513).

Almost surely, 2^2721277961 is an apocalyptic number.

It is an amenable number.

2721277961 is a deficient number, since it is larger than the sum of its proper divisors (73548091).

2721277961 is an equidigital number, since it uses as much as digits as its factorization.

2721277961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73548090.

The product of its digits is 148176, while the sum is 44.

The square root of 2721277961 is about 52165.8696946576. The cubic root of 2721277961 is about 1396.1249920582.

The spelling of 2721277961 in words is "two billion, seven hundred twenty-one million, two hundred seventy-seven thousand, nine hundred sixty-one".