47700509 has 4 divisors (see below), whose sum is σ = 47751516. Its totient is φ = 47649504.

The previous prime is 47700503. The next prime is 47700517. The reversal of 47700509 is 90500774.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36120100 + 11580409 = 6010^2 + 3403^2 .

It is a cyclic number.

It is not a de Polignac number, because 47700509 - 2²⁰ = 46651933 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 (47700503) 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, 24074 + ... + 25979.

It is an arithmetic number, because the mean of its divisors is an integer number (11937879).

Almost surely, 2^47700509 is an apocalyptic number.

It is an amenable number.

47700509 is a deficient number, since it is larger than the sum of its proper divisors (51007).

47700509 is an equidigital number, since it uses as much as digits as its factorization.

47700509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51006.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 47700509 is about 6906.5555090798. Note that the first 4 decimals coincide. The cubic root of 47700509 is about 362.6666921038. Note that the first 4 decimals are identical.

The spelling of 47700509 in words is "forty-seven million, seven hundred thousand, five hundred nine".