821383741 has 2 divisors, whose sum is σ = 821383742. Its totient is φ = 821383740.

The previous prime is 821383729. The next prime is 821383763. The reversal of 821383741 is 147383128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430728516 + 390655225 = 20754^2 + 19765^2 .

It is a cyclic number.

It is not a de Polignac number, because 821383741 - 2⁹ = 821383229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 821383741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821387741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410691870 + 410691871.

It is an arithmetic number, because the mean of its divisors is an integer number (410691871).

Almost surely, 2^821383741 is an apocalyptic number.

It is an amenable number.

821383741 is a deficient number, since it is larger than the sum of its proper divisors (1).

821383741 is an equidigital number, since it uses as much as digits as its factorization.

821383741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 821383741 is about 28659.7931081158. The cubic root of 821383741 is about 936.5163574841.

The spelling of 821383741 in words is "eight hundred twenty-one million, three hundred eighty-three thousand, seven hundred forty-one".