6232781981 has 4 divisors (see below), whose sum is σ = 6233818752. Its totient is φ = 6231745212.

The previous prime is 6232781957. The next prime is 6232782037. The reversal of 6232781981 is 1891872326.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1891872326 = 2 ⋅945936163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6232781981 is a prime.

It is a super-2 number, since 2×6232781981² = 77695142445356568722, 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 (6232781881) 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, 509315 + ... + 521408.

It is an arithmetic number, because the mean of its divisors is an integer number (1558454688).

Almost surely, 2^6232781981 is an apocalyptic number.

It is an amenable number.

6232781981 is a deficient number, since it is larger than the sum of its proper divisors (1036771).

6232781981 is a wasteful number, since it uses less digits than its factorization.

6232781981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036770.

The product of its digits is 290304, while the sum is 47.

The square root of 6232781981 is about 78947.9700879003. The cubic root of 6232781981 is about 1840.3226809829.

The spelling of 6232781981 in words is "six billion, two hundred thirty-two million, seven hundred eighty-one thousand, nine hundred eighty-one".