47891689 has 2 divisors, whose sum is σ = 47891690. Its totient is φ = 47891688.

The previous prime is 47891671. The next prime is 47891707. The reversal of 47891689 is 98619874.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (47891671) and next prime (47891707).

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 12131289 = 5980^2 + 3483^2 .

It is a cyclic number.

It is not a de Polignac number, because 47891689 - 2¹¹ = 47889641 is a prime.

It is a super-2 number, since 2×47891689² = 4587227750545442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (47891659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23945844 + 23945845.

It is an arithmetic number, because the mean of its divisors is an integer number (23945845).

Almost surely, 2^47891689 is an apocalyptic number.

It is an amenable number.

47891689 is a deficient number, since it is larger than the sum of its proper divisors (1).

47891689 is an equidigital number, since it uses as much as digits as its factorization.

47891689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 52.

The square root of 47891689 is about 6920.3821426277. The cubic root of 47891689 is about 363.1505597191.

The spelling of 47891689 in words is "forty-seven million, eight hundred ninety-one thousand, six hundred eighty-nine".