47251209 has 4 divisors (see below), whose sum is σ = 63001616. Its totient is φ = 31500804.

The previous prime is 47251201. The next prime is 47251241. The reversal of 47251209 is 90215274.

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.

It is not a de Polignac number, because 47251209 - 2³ = 47251201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47251201) 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, 7875199 + ... + 7875204.

It is an arithmetic number, because the mean of its divisors is an integer number (15750404).

Almost surely, 2^47251209 is an apocalyptic number.

It is an amenable number.

47251209 is a deficient number, since it is larger than the sum of its proper divisors (15750407).

47251209 is a wasteful number, since it uses less digits than its factorization.

47251209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15750406.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 47251209 is about 6873.9514836810. The cubic root of 47251209 is about 361.5244230518.

It can be divided in two parts, 472 and 51209, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 47251209 in words is "forty-seven million, two hundred fifty-one thousand, two hundred nine".