47631509 has 2 divisors, whose sum is σ = 47631510. Its totient is φ = 47631508.

The previous prime is 47631503. The next prime is 47631523. The reversal of 47631509 is 90513674.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35402500 + 12229009 = 5950^2 + 3497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47631509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47631503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23815754 + 23815755.

It is an arithmetic number, because the mean of its divisors is an integer number (23815755).

Almost surely, 2^47631509 is an apocalyptic number.

It is an amenable number.

47631509 is a deficient number, since it is larger than the sum of its proper divisors (1).

47631509 is an equidigital number, since it uses as much as digits as its factorization.

47631509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 47631509 is about 6901.5584471915. The cubic root of 47631509 is about 362.4917388526.

The spelling of 47631509 in words is "forty-seven million, six hundred thirty-one thousand, five hundred nine".