533681921 has 2 divisors, whose sum is σ = 533681922. Its totient is φ = 533681920.

The previous prime is 533681887. The next prime is 533681933. The reversal of 533681921 is 129186335.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 407434225 + 126247696 = 20185^2 + 11236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-533681921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (533681021) 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 as a sum of consecutive naturals, namely, 266840960 + 266840961.

It is an arithmetic number, because the mean of its divisors is an integer number (266840961).

Almost surely, 2^533681921 is an apocalyptic number.

It is an amenable number.

533681921 is a deficient number, since it is larger than the sum of its proper divisors (1).

533681921 is an equidigital number, since it uses as much as digits as its factorization.

533681921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 533681921 is about 23101.5566791504. The cubic root of 533681921 is about 811.1369093141.

The spelling of 533681921 in words is "five hundred thirty-three million, six hundred eighty-one thousand, nine hundred twenty-one".