47945521 has 4 divisors (see below), whose sum is σ = 51633652. Its totient is φ = 44257392.

The previous prime is 47945507. The next prime is 47945537. The reversal of 47945521 is 12554974.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12554974 = 2 ⋅6277487.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 37454400 = 3239^2 + 6120^2 .

It is a cyclic number.

It is not a de Polignac number, because 47945521 - 2¹⁹ = 47421233 is a prime.

It is a super-2 number, since 2×47945521² = 4597545967922882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45945521) 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, 1844046 + ... + 1844071.

It is an arithmetic number, because the mean of its divisors is an integer number (12908413).

Almost surely, 2^47945521 is an apocalyptic number.

It is an amenable number.

47945521 is a deficient number, since it is larger than the sum of its proper divisors (3688131).

47945521 is a wasteful number, since it uses less digits than its factorization.

47945521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688130.

The product of its digits is 50400, while the sum is 37.

The square root of 47945521 is about 6924.2704308830. The cubic root of 47945521 is about 363.2865735820.

The spelling of 47945521 in words is "forty-seven million, nine hundred forty-five thousand, five hundred twenty-one".