74822821 has 2 divisors, whose sum is σ = 74822822. Its totient is φ = 74822820.

The previous prime is 74822807. The next prime is 74822857. The reversal of 74822821 is 12822847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 23184225 = 7186^2 + 4815^2 .

It is an emirp because it is prime and its reverse (12822847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74822821 - 2⁵ = 74822789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74822221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37411410 + 37411411.

It is an arithmetic number, because the mean of its divisors is an integer number (37411411).

Almost surely, 2^74822821 is an apocalyptic number.

It is an amenable number.

74822821 is a deficient number, since it is larger than the sum of its proper divisors (1).

74822821 is an equidigital number, since it uses as much as digits as its factorization.

74822821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 34.

The square root of 74822821 is about 8650.0185548934. The cubic root of 74822821 is about 421.3839851217.

The spelling of 74822821 in words is "seventy-four million, eight hundred twenty-two thousand, eight hundred twenty-one".