47531009 has 2 divisors, whose sum is σ = 47531010. Its totient is φ = 47531008.

The previous prime is 47530981. The next prime is 47531023. The reversal of 47531009 is 90013574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45265984 + 2265025 = 6728^2 + 1505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47531009 is a prime.

It is not a weakly prime, because it can be changed into another prime (47531059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23765504 + 23765505.

It is an arithmetic number, because the mean of its divisors is an integer number (23765505).

Almost surely, 2^47531009 is an apocalyptic number.

It is an amenable number.

47531009 is a deficient number, since it is larger than the sum of its proper divisors (1).

47531009 is an equidigital number, since it uses as much as digits as its factorization.

47531009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 47531009 is about 6894.2736383175. The cubic root of 47531009 is about 362.2366131127.

The spelling of 47531009 in words is "forty-seven million, five hundred thirty-one thousand, nine".