47772281 has 4 divisors (see below), whose sum is σ = 47786112. Its totient is φ = 47758452.

The previous prime is 47772233. The next prime is 47772287. The reversal of 47772281 is 18227774.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 47772281 - 2¹⁸ = 47510137 is a prime.

It is a super-2 number, since 2×47772281² = 4564381663885922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47772287) 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, 3140 + ... + 10266.

It is an arithmetic number, because the mean of its divisors is an integer number (11946528).

Almost surely, 2^47772281 is an apocalyptic number.

It is an amenable number.

47772281 is a deficient number, since it is larger than the sum of its proper divisors (13831).

47772281 is an equidigital number, since it uses as much as digits as its factorization.

47772281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13830.

The product of its digits is 43904, while the sum is 38.

The square root of 47772281 is about 6911.7494890946. The cubic root of 47772281 is about 362.8484949845.

The spelling of 47772281 in words is "forty-seven million, seven hundred seventy-two thousand, two hundred eighty-one".