2620781311 has 4 divisors (see below), whose sum is σ = 2621050624. Its totient is φ = 2620512000.

The previous prime is 2620781297. The next prime is 2620781347. The reversal of 2620781311 is 1131870262.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2620781311 - 2²⁵ = 2587226879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620881311) 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, 119490 + ... + 139711.

It is an arithmetic number, because the mean of its divisors is an integer number (655262656).

Almost surely, 2^2620781311 is an apocalyptic number.

2620781311 is a deficient number, since it is larger than the sum of its proper divisors (269313).

2620781311 is a wasteful number, since it uses less digits than its factorization.

2620781311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269312.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2620781311 is about 51193.5670861096. The cubic root of 2620781311 is about 1378.7227050947.

The spelling of 2620781311 in words is "two billion, six hundred twenty million, seven hundred eighty-one thousand, three hundred eleven".