2642857381 has 4 divisors (see below), whose sum is σ = 2643007500. Its totient is φ = 2642707264.

The previous prime is 2642857379. The next prime is 2642857397. The reversal of 2642857381 is 1837582462.

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 1813993281 + 828864100 = 42591^2 + 28790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642857381 - 2¹ = 2642857379 is a prime.

It is a super-2 number, since 2×2642857381² = 13969390272612358322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2642857351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44506 + ... + 85243.

It is an arithmetic number, because the mean of its divisors is an integer number (660751875).

Almost surely, 2^2642857381 is an apocalyptic number.

It is an amenable number.

2642857381 is a deficient number, since it is larger than the sum of its proper divisors (150119).

2642857381 is a wasteful number, since it uses less digits than its factorization.

2642857381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150118.

The product of its digits is 645120, while the sum is 46.

The square root of 2642857381 is about 51408.7286460189. The cubic root of 2642857381 is about 1382.5830953066.

The spelling of 2642857381 in words is "two billion, six hundred forty-two million, eight hundred fifty-seven thousand, three hundred eighty-one".