47809451 has 2 divisors, whose sum is σ = 47809452. Its totient is φ = 47809450.

The previous prime is 47809427. The next prime is 47809477. The reversal of 47809451 is 15490874.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47809451 - 2²² = 43615147 is a prime.

It is not a weakly prime, because it can be changed into another prime (47809051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23904725 + 23904726.

It is an arithmetic number, because the mean of its divisors is an integer number (23904726).

Almost surely, 2^47809451 is an apocalyptic number.

47809451 is a deficient number, since it is larger than the sum of its proper divisors (1).

47809451 is an equidigital number, since it uses as much as digits as its factorization.

47809451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 47809451 is about 6914.4378657994. The cubic root of 47809451 is about 362.9425773117.

The spelling of 47809451 in words is "forty-seven million, eight hundred nine thousand, four hundred fifty-one".