47221731 has 16 divisors (see below), whose sum is σ = 71850400. Its totient is φ = 30629664.

The previous prime is 47221723. The next prime is 47221739. The reversal of 47221731 is 13712274.

It is a happy number.

47221731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (47221723) and next prime (47221739).

It is not a de Polignac number, because 47221731 - 2³ = 47221723 is a prime.

It is a super-2 number, since 2×47221731² = 4459783757272722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47221695 and 47221704.

It is not an unprimeable number, because it can be changed into a prime (47221739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22636 + ... + 24633.

It is an arithmetic number, because the mean of its divisors is an integer number (4490650).

Almost surely, 2^47221731 is an apocalyptic number.

47221731 is a deficient number, since it is larger than the sum of its proper divisors (24628669).

47221731 is a wasteful number, since it uses less digits than its factorization.

47221731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47315 (or 47309 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 47221731 is about 6871.8069676032. The cubic root of 47221731 is about 361.4492275589.

The spelling of 47221731 in words is "forty-seven million, two hundred twenty-one thousand, seven hundred thirty-one".