1823966981 has 2 divisors, whose sum is σ = 1823966982. Its totient is φ = 1823966980.

The previous prime is 1823966957. The next prime is 1823966987. The reversal of 1823966981 is 1896693281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1818254881 + 5712100 = 42641^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1823966981 is a prime.

It is a super-2 number, since 2×1823966981² = 6653711095556508722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1823966987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911983490 + 911983491.

It is an arithmetic number, because the mean of its divisors is an integer number (911983491).

Almost surely, 2^1823966981 is an apocalyptic number.

It is an amenable number.

1823966981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1823966981 is an equidigital number, since it uses as much as digits as its factorization.

1823966981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 53.

The square root of 1823966981 is about 42707.9264422894. The cubic root of 1823966981 is about 1221.8155761212.

The spelling of 1823966981 in words is "one billion, eight hundred twenty-three million, nine hundred sixty-six thousand, nine hundred eighty-one".