783475981 has 2 divisors, whose sum is σ = 783475982. Its totient is φ = 783475980.

The previous prime is 783475967. The next prime is 783475993. The reversal of 783475981 is 189574387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 769563081 + 13912900 = 27741^2 + 3730^2 .

It is an emirp because it is prime and its reverse (189574387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 783475981 - 2¹⁹ = 782951693 is a prime.

It is a super-2 number, since 2×783475981² = 1227669225607824722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (783475921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391737990 + 391737991.

It is an arithmetic number, because the mean of its divisors is an integer number (391737991).

Almost surely, 2^783475981 is an apocalyptic number.

It is an amenable number.

783475981 is a deficient number, since it is larger than the sum of its proper divisors (1).

783475981 is an equidigital number, since it uses as much as digits as its factorization.

783475981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The square root of 783475981 is about 27990.6409537188. The cubic root of 783475981 is about 921.8817741699.

The spelling of 783475981 in words is "seven hundred eighty-three million, four hundred seventy-five thousand, nine hundred eighty-one".