47945509 has 4 divisors (see below), whose sum is σ = 48005440. Its totient is φ = 47885580.

The previous prime is 47945507. The next prime is 47945537. The reversal of 47945509 is 90554974.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90554974 = 2 ⋅45277487.

It is a cyclic number.

It is not a de Polignac number, because 47945509 - 2¹ = 47945507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47945507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28749 + ... + 30370.

It is an arithmetic number, because the mean of its divisors is an integer number (12001360).

Almost surely, 2^47945509 is an apocalyptic number.

It is an amenable number.

47945509 is a deficient number, since it is larger than the sum of its proper divisors (59931).

47945509 is an equidigital number, since it uses as much as digits as its factorization.

47945509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59930.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 47945509 is about 6924.2695643656. The cubic root of 47945509 is about 363.2865432737.

The spelling of 47945509 in words is "forty-seven million, nine hundred forty-five thousand, five hundred nine".