2765321381 has 4 divisors (see below), whose sum is σ = 2766710892.
Its totient is φ = 2763931872.
The previous prime is 2765321341. The next prime is 2765321387. The reversal of 2765321381 is 1831235672.
2765321381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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 743380225 + 2021941156 = 27265^2 + 44966^2
It is a cyclic number.
It is not a de Polignac number, because 2765321381 - 210 = 2765320357 is a prime.
It is a super-2 number, since 2×27653213812 = 15294004680431494322, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2765321387) 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, 691766 + ... + 695751.
It is an arithmetic number, because the mean of its divisors is an integer number (691677723).
Almost surely, 22765321381 is an apocalyptic number.
It is an amenable number.
2765321381 is a deficient number, since it is larger than the sum of its proper divisors (1389511).
2765321381 is a wasteful number, since it uses less digits than its factorization.
2765321381 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1389510.
The product of its digits is 60480, while the sum is 38.
The square root of 2765321381 is about 52586.3231363441.
The cubic root of 2765321381 is about 1403.6167337560.
The spelling of 2765321381 in words is "two billion, seven hundred sixty-five million, three hundred twenty-one thousand, three hundred eighty-one".