53198921 has 2 divisors, whose sum is σ = 53198922. Its totient is φ = 53198920.

The previous prime is 53198911. The next prime is 53198927. The reversal of 53198921 is 12989135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31483321 + 21715600 = 5611^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 53198921 - 2⁶ = 53198857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (53198927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26599460 + 26599461.

It is an arithmetic number, because the mean of its divisors is an integer number (26599461).

Almost surely, 2^53198921 is an apocalyptic number.

It is an amenable number.

53198921 is a deficient number, since it is larger than the sum of its proper divisors (1).

53198921 is an equidigital number, since it uses as much as digits as its factorization.

53198921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 53198921 is about 7293.7590445531. The cubic root of 53198921 is about 376.0979284121.

The spelling of 53198921 in words is "fifty-three million, one hundred ninety-eight thousand, nine hundred twenty-one".