47521709 has 2 divisors, whose sum is σ = 47521710. Its totient is φ = 47521708.

The previous prime is 47521699. The next prime is 47521741. The reversal of 47521709 is 90712574.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46199209 + 1322500 = 6797^2 + 1150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47521709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47521909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23760854 + 23760855.

It is an arithmetic number, because the mean of its divisors is an integer number (23760855).

Almost surely, 2^47521709 is an apocalyptic number.

It is an amenable number.

47521709 is a deficient number, since it is larger than the sum of its proper divisors (1).

47521709 is an equidigital number, since it uses as much as digits as its factorization.

47521709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 47521709 is about 6893.5991325287. The cubic root of 47521709 is about 362.2129862895.

The spelling of 47521709 in words is "forty-seven million, five hundred twenty-one thousand, seven hundred nine".