2720948561 has 4 divisors (see below), whose sum is σ = 2864156400. Its totient is φ = 2577740724.

The previous prime is 2720948557. The next prime is 2720948569. The reversal of 2720948561 is 1658490272.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2720948561 - 2² = 2720948557 is a prime.

It is a super-2 number, since 2×2720948561² = 14807122143215941442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2720948569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71603891 + ... + 71603928.

It is an arithmetic number, because the mean of its divisors is an integer number (716039100).

Almost surely, 2^2720948561 is an apocalyptic number.

It is an amenable number.

2720948561 is a deficient number, since it is larger than the sum of its proper divisors (143207839).

2720948561 is a wasteful number, since it uses less digits than its factorization.

2720948561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143207838.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 2720948561 is about 52162.7123623762. The cubic root of 2720948561 is about 1396.0686579711.

The spelling of 2720948561 in words is "two billion, seven hundred twenty million, nine hundred forty-eight thousand, five hundred sixty-one".