52221649 has 2 divisors, whose sum is σ = 52221650. Its totient is φ = 52221648.

The previous prime is 52221647. The next prime is 52221677. The reversal of 52221649 is 94612225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49956624 + 2265025 = 7068^2 + 1505^2 .

It is a cyclic number.

It is not a de Polignac number, because 52221649 - 2¹ = 52221647 is a prime.

Together with 52221647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 52221649.

It is not a weakly prime, because it can be changed into another prime (52221641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26110824 + 26110825.

It is an arithmetic number, because the mean of its divisors is an integer number (26110825).

Almost surely, 2^52221649 is an apocalyptic number.

It is an amenable number.

52221649 is a deficient number, since it is larger than the sum of its proper divisors (1).

52221649 is an equidigital number, since it uses as much as digits as its factorization.

52221649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 52221649 is about 7226.4548016299. The cubic root of 52221649 is about 373.7806891949.

The spelling of 52221649 in words is "fifty-two million, two hundred twenty-one thousand, six hundred forty-nine".