47817145 has 4 divisors (see below), whose sum is σ = 57380580. Its totient is φ = 38253712.

The previous prime is 47817139. The next prime is 47817149. The reversal of 47817145 is 54171874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54171874 = 2 ⋅27085937.

It can be written as a sum of positive squares in 2 ways, for example, as 6446521 + 41370624 = 2539^2 + 6432^2 .

It is a cyclic number.

It is not a de Polignac number, because 47817145 - 2¹³ = 47808953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47817149) 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, 4781710 + ... + 4781719.

It is an arithmetic number, because the mean of its divisors is an integer number (14345145).

Almost surely, 2^47817145 is an apocalyptic number.

It is an amenable number.

47817145 is a deficient number, since it is larger than the sum of its proper divisors (9563435).

47817145 is an equidigital number, since it uses as much as digits as its factorization.

47817145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9563434.

The product of its digits is 31360, while the sum is 37.

The square root of 47817145 is about 6914.9942154712. The cubic root of 47817145 is about 362.9620457804.

The spelling of 47817145 in words is "forty-seven million, eight hundred seventeen thousand, one hundred forty-five".