47521517 has 4 divisors (see below), whose sum is σ = 49160220. Its totient is φ = 45882816.

The previous prime is 47521499. The next prime is 47521541. The reversal of 47521517 is 71512574.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10201636 + 37319881 = 3194^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 47521517 - 2¹⁶ = 47455981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47521547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819308 + ... + 819365.

It is an arithmetic number, because the mean of its divisors is an integer number (12290055).

Almost surely, 2^47521517 is an apocalyptic number.

It is an amenable number.

47521517 is a deficient number, since it is larger than the sum of its proper divisors (1638703).

47521517 is a wasteful number, since it uses less digits than its factorization.

47521517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638702.

The product of its digits is 9800, while the sum is 32.

The square root of 47521517 is about 6893.5852065525. The cubic root of 47521517 is about 362.2124984774.

The spelling of 47521517 in words is "forty-seven million, five hundred twenty-one thousand, five hundred seventeen".