47312509 has 2 divisors, whose sum is σ = 47312510. Its totient is φ = 47312508.

The previous prime is 47312501. The next prime is 47312521. The reversal of 47312509 is 90521374.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47306884 + 5625 = 6878^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 47312509 - 2³ = 47312501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47312501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23656254 + 23656255.

It is an arithmetic number, because the mean of its divisors is an integer number (23656255).

Almost surely, 2^47312509 is an apocalyptic number.

It is an amenable number.

47312509 is a deficient number, since it is larger than the sum of its proper divisors (1).

47312509 is an equidigital number, since it uses as much as digits as its factorization.

47312509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 47312509 is about 6878.4089003199. The cubic root of 47312509 is about 361.6806932722.

The spelling of 47312509 in words is "forty-seven million, three hundred twelve thousand, five hundred nine".