47665991 has 2 divisors, whose sum is σ = 47665992. Its totient is φ = 47665990.

The previous prime is 47665979. The next prime is 47666009. The reversal of 47665991 is 19956674.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47665991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47665951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23832995 + 23832996.

It is an arithmetic number, because the mean of its divisors is an integer number (23832996).

Almost surely, 2^47665991 is an apocalyptic number.

47665991 is a deficient number, since it is larger than the sum of its proper divisors (1).

47665991 is an equidigital number, since it uses as much as digits as its factorization.

47665991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 47665991 is about 6904.0561266548. The cubic root of 47665991 is about 362.5791909430.

The spelling of 47665991 in words is "forty-seven million, six hundred sixty-five thousand, nine hundred ninety-one".