65113991 has 2 divisors, whose sum is σ = 65113992. Its totient is φ = 65113990.

The previous prime is 65113987. The next prime is 65113999. The reversal of 65113991 is 19931156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65113991 - 2² = 65113987 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65113999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32556995 + 32556996.

It is an arithmetic number, because the mean of its divisors is an integer number (32556996).

Almost surely, 2^65113991 is an apocalyptic number.

65113991 is a deficient number, since it is larger than the sum of its proper divisors (1).

65113991 is an equidigital number, since it uses as much as digits as its factorization.

65113991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 35.

The square root of 65113991 is about 8069.3240733038. The cubic root of 65113991 is about 402.3074778523.

The spelling of 65113991 in words is "sixty-five million, one hundred thirteen thousand, nine hundred ninety-one".