763381921 has 2 divisors, whose sum is σ = 763381922. Its totient is φ = 763381920.

The previous prime is 763381903. The next prime is 763381939. The reversal of 763381921 is 129183367.

It is a balanced prime because it is at equal distance from previous prime (763381903) and next prime (763381939).

It can be written as a sum of positive squares in only one way, i.e., 711022225 + 52359696 = 26665^2 + 7236^2 .

It is an emirp because it is prime and its reverse (129183367) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-763381921 is a prime.

It is not a weakly prime, because it can be changed into another prime (763381901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 381690960 + 381690961.

It is an arithmetic number, because the mean of its divisors is an integer number (381690961).

Almost surely, 2^763381921 is an apocalyptic number.

It is an amenable number.

763381921 is a deficient number, since it is larger than the sum of its proper divisors (1).

763381921 is an equidigital number, since it uses as much as digits as its factorization.

763381921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 763381921 is about 27629.3670032449. The cubic root of 763381921 is about 913.9321536846.

The spelling of 763381921 in words is "seven hundred sixty-three million, three hundred eighty-one thousand, nine hundred twenty-one".