763813021 has 4 divisors (see below), whose sum is σ = 763958844. Its totient is φ = 763667200.

The previous prime is 763813019. The next prime is 763813033. The reversal of 763813021 is 120318367.

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 629508100 + 134304921 = 25090^2 + 11589^2 .

It is a cyclic number.

It is not a de Polignac number, because 763813021 - 2¹ = 763813019 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (763813081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64750 + ... + 75631.

It is an arithmetic number, because the mean of its divisors is an integer number (190989711).

Almost surely, 2^763813021 is an apocalyptic number.

It is an amenable number.

763813021 is a deficient number, since it is larger than the sum of its proper divisors (145823).

763813021 is a wasteful number, since it uses less digits than its factorization.

763813021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145822.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 763813021 is about 27637.1673837968. The cubic root of 763813021 is about 914.1041610803.

The spelling of 763813021 in words is "seven hundred sixty-three million, eight hundred thirteen thousand, twenty-one".