2851321381 has 4 divisors (see below), whose sum is σ = 2890380652. Its totient is φ = 2812262112.

The previous prime is 2851321337. The next prime is 2851321409. The reversal of 2851321381 is 1831231582.

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 1663416225 + 1187905156 = 40785^2 + 34466^2 .

It is a cyclic number.

It is not a de Polignac number, because 2851321381 - 2¹³ = 2851313189 is a prime.

It is a super-2 number, since 2×2851321381² = 16260067235495494322, 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 (2851321301) 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, 19529526 + ... + 19529671.

It is an arithmetic number, because the mean of its divisors is an integer number (722595163).

Almost surely, 2^2851321381 is an apocalyptic number.

It is an amenable number.

2851321381 is a deficient number, since it is larger than the sum of its proper divisors (39059271).

2851321381 is an equidigital number, since it uses as much as digits as its factorization.

2851321381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39059270.

The product of its digits is 11520, while the sum is 34.

The square root of 2851321381 is about 53397.7656929576. The cubic root of 2851321381 is about 1418.0190225777.

It can be divided in two parts, 28513 and 21381, that added together give a palindrome (49894).

The spelling of 2851321381 in words is "two billion, eight hundred fifty-one million, three hundred twenty-one thousand, three hundred eighty-one".