47745409 has 2 divisors, whose sum is σ = 47745410. Its totient is φ = 47745408.

The previous prime is 47745407. The next prime is 47745419. The reversal of 47745409 is 90454774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41319184 + 6426225 = 6428^2 + 2535^2 .

It is a cyclic number.

It is not a de Polignac number, because 47745409 - 2¹ = 47745407 is a prime.

Together with 47745407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47745407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23872704 + 23872705.

It is an arithmetic number, because the mean of its divisors is an integer number (23872705).

Almost surely, 2^47745409 is an apocalyptic number.

It is an amenable number.

47745409 is a deficient number, since it is larger than the sum of its proper divisors (1).

47745409 is an equidigital number, since it uses as much as digits as its factorization.

47745409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 47745409 is about 6909.8052794561. The cubic root of 47745409 is about 362.7804478984.

The spelling of 47745409 in words is "forty-seven million, seven hundred forty-five thousand, four hundred nine".