53115991 has 2 divisors, whose sum is σ = 53115992. Its totient is φ = 53115990.

The previous prime is 53115983. The next prime is 53116013. The reversal of 53115991 is 19951135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53115991 - 2³ = 53115983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53115941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26557995 + 26557996.

It is an arithmetic number, because the mean of its divisors is an integer number (26557996).

Almost surely, 2^53115991 is an apocalyptic number.

53115991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53115991 is an equidigital number, since it uses as much as digits as its factorization.

53115991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6075, while the sum is 34.

The square root of 53115991 is about 7288.0718300522. The cubic root of 53115991 is about 375.9023979917.

The spelling of 53115991 in words is "fifty-three million, one hundred fifteen thousand, nine hundred ninety-one".