53539991 has 2 divisors, whose sum is σ = 53539992. Its totient is φ = 53539990.

The previous prime is 53539979. The next prime is 53540027. The reversal of 53539991 is 19993535.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53539991 - 2¹⁴ = 53523607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53539961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26769995 + 26769996.

It is an arithmetic number, because the mean of its divisors is an integer number (26769996).

Almost surely, 2^53539991 is an apocalyptic number.

53539991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53539991 is an equidigital number, since it uses as much as digits as its factorization.

53539991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164025, while the sum is 44.

The square root of 53539991 is about 7317.1026369732. The cubic root of 53539991 is about 376.8999657195.

The spelling of 53539991 in words is "fifty-three million, five hundred thirty-nine thousand, nine hundred ninety-one".