53839991 has 2 divisors, whose sum is σ = 53839992. Its totient is φ = 53839990.

The previous prime is 53839943. The next prime is 53839993. The reversal of 53839991 is 19993835.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53839991 - 2¹⁸ = 53577847 is a prime.

It is a Sophie Germain prime.

Together with 53839993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53839993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26919995 + 26919996.

It is an arithmetic number, because the mean of its divisors is an integer number (26919996).

Almost surely, 2^53839991 is an apocalyptic number.

53839991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53839991 is an equidigital number, since it uses as much as digits as its factorization.

53839991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 47.

The square root of 53839991 is about 7337.5739178560. The cubic root of 53839991 is about 377.6026146782.

The spelling of 53839991 in words is "fifty-three million, eight hundred thirty-nine thousand, nine hundred ninety-one".