47903209 has 2 divisors, whose sum is σ = 47903210. Its totient is φ = 47903208.

The previous prime is 47903173. The next prime is 47903231. The reversal of 47903209 is 90230974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32809984 + 15093225 = 5728^2 + 3885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47903209 is a prime.

It is equal to p_2882725 and since 47903209 and 2882725 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (47903249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23951604 + 23951605.

It is an arithmetic number, because the mean of its divisors is an integer number (23951605).

Almost surely, 2^47903209 is an apocalyptic number.

It is an amenable number.

47903209 is a deficient number, since it is larger than the sum of its proper divisors (1).

47903209 is an equidigital number, since it uses as much as digits as its factorization.

47903209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 47903209 is about 6921.2144165601. The cubic root of 47903209 is about 363.1796751331.

The spelling of 47903209 in words is "forty-seven million, nine hundred three thousand, two hundred nine".