47256509 has 2 divisors, whose sum is σ = 47256510. Its totient is φ = 47256508.

The previous prime is 47256497. The next prime is 47256533. The reversal of 47256509 is 90565274.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40896025 + 6360484 = 6395^2 + 2522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47256509 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47256589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23628254 + 23628255.

It is an arithmetic number, because the mean of its divisors is an integer number (23628255).

Almost surely, 2^47256509 is an apocalyptic number.

It is an amenable number.

47256509 is a deficient number, since it is larger than the sum of its proper divisors (1).

47256509 is an equidigital number, since it uses as much as digits as its factorization.

47256509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 47256509 is about 6874.3369862118. The cubic root of 47256509 is about 361.5379395159.

The spelling of 47256509 in words is "forty-seven million, two hundred fifty-six thousand, five hundred nine".