926987821 has 2 divisors, whose sum is σ = 926987822. Its totient is φ = 926987820.

The previous prime is 926987779. The next prime is 926987843. The reversal of 926987821 is 128789629.

926987821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 585107721 + 341880100 = 24189^2 + 18490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-926987821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (926987521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 463493910 + 463493911.

It is an arithmetic number, because the mean of its divisors is an integer number (463493911).

Almost surely, 2^926987821 is an apocalyptic number.

It is an amenable number.

926987821 is a deficient number, since it is larger than the sum of its proper divisors (1).

926987821 is an equidigital number, since it uses as much as digits as its factorization.

926987821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 926987821 is about 30446.4746891984. The cubic root of 926987821 is about 975.0450370605.

The spelling of 926987821 in words is "nine hundred twenty-six million, nine hundred eighty-seven thousand, eight hundred twenty-one".