53820191 has 2 divisors, whose sum is σ = 53820192. Its totient is φ = 53820190.

The previous prime is 53820149. The next prime is 53820209. The reversal of 53820191 is 19102835.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53820191 - 2¹⁰ = 53819167 is a prime.

It is a super-2 number, since 2×53820191² = 5793225918552962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53820101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26910095 + 26910096.

It is an arithmetic number, because the mean of its divisors is an integer number (26910096).

Almost surely, 2^53820191 is an apocalyptic number.

53820191 is a deficient number, since it is larger than the sum of its proper divisors (1).

53820191 is an equidigital number, since it uses as much as digits as its factorization.

53820191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 53820191 is about 7336.2245739890. The cubic root of 53820191 is about 377.5563204130.

The spelling of 53820191 in words is "fifty-three million, eight hundred twenty thousand, one hundred ninety-one".