7214288381 has 4 divisors (see below), whose sum is σ = 7215152700. Its totient is φ = 7213424064.

The previous prime is 7214288357. The next prime is 7214288413. The reversal of 7214288381 is 1838824127.

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 3610207225 + 3604081156 = 60085^2 + 60034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7214288381 is a prime.

It is a super-2 number, since 2×7214288381² (a number of 21 digits) 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 (7214288881) 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, 419516 + ... + 436373.

It is an arithmetic number, because the mean of its divisors is an integer number (1803788175).

Almost surely, 2^7214288381 is an apocalyptic number.

It is an amenable number.

7214288381 is a deficient number, since it is larger than the sum of its proper divisors (864319).

7214288381 is an equidigital number, since it uses as much as digits as its factorization.

7214288381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864318.

The product of its digits is 172032, while the sum is 44.

The square root of 7214288381 is about 84936.9671050244. The cubic root of 7214288381 is about 1932.2552659391.

The spelling of 7214288381 in words is "seven billion, two hundred fourteen million, two hundred eighty-eight thousand, three hundred eighty-one".