47540509 has 2 divisors, whose sum is σ = 47540510. Its totient is φ = 47540508.

The previous prime is 47540497. The next prime is 47540513. The reversal of 47540509 is 90504574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 20448484 = 5205^2 + 4522^2 .

It is a cyclic number.

It is not a de Polignac number, because 47540509 - 2⁵ = 47540477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47540209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23770254 + 23770255.

It is an arithmetic number, because the mean of its divisors is an integer number (23770255).

Almost surely, 2^47540509 is an apocalyptic number.

It is an amenable number.

47540509 is a deficient number, since it is larger than the sum of its proper divisors (1).

47540509 is an equidigital number, since it uses as much as digits as its factorization.

47540509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 47540509 is about 6894.9625814793. The cubic root of 47540509 is about 362.2607448578.

The spelling of 47540509 in words is "forty-seven million, five hundred forty thousand, five hundred nine".