47109581 has 2 divisors, whose sum is σ = 47109582. Its totient is φ = 47109580.

The previous prime is 47109539. The next prime is 47109619. The reversal of 47109581 is 18590174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41860900 + 5248681 = 6470^2 + 2291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47109581 is a prime.

It is a super-2 number, since 2×47109581² = 4438625243991122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47109511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23554790 + 23554791.

It is an arithmetic number, because the mean of its divisors is an integer number (23554791).

Almost surely, 2^47109581 is an apocalyptic number.

It is an amenable number.

47109581 is a deficient number, since it is larger than the sum of its proper divisors (1).

47109581 is an equidigital number, since it uses as much as digits as its factorization.

47109581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 47109581 is about 6863.6419632729. The cubic root of 47109581 is about 361.1628575383.

The spelling of 47109581 in words is "forty-seven million, one hundred nine thousand, five hundred eighty-one".