47121605 has 4 divisors (see below), whose sum is σ = 56545932. Its totient is φ = 37697280.

The previous prime is 47121601. The next prime is 47121629. The reversal of 47121605 is 50612174.

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 31550689 + 15570916 = 5617^2 + 3946^2 .

It is not a de Polignac number, because 47121605 - 2² = 47121601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47121601) 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, 4712156 + ... + 4712165.

It is an arithmetic number, because the mean of its divisors is an integer number (14136483).

Almost surely, 2^47121605 is an apocalyptic number.

It is an amenable number.

47121605 is a deficient number, since it is larger than the sum of its proper divisors (9424327).

47121605 is an equidigital number, since it uses as much as digits as its factorization.

47121605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9424326.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 47121605 is about 6864.5178272039. The cubic root of 47121605 is about 361.1935820229.

Adding to 47121605 its reverse (50612174), we get a palindrome (97733779).

The spelling of 47121605 in words is "forty-seven million, one hundred twenty-one thousand, six hundred five".