45431221 has 4 divisors (see below), whose sum is σ = 49561344. Its totient is φ = 41301100.

The previous prime is 45431203. The next prime is 45431257. The reversal of 45431221 is 12213454.

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.

It is a cyclic number.

It is not a de Polignac number, because 45431221 - 2⁵ = 45431189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45431192 and 45431201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45431201) 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, 2065045 + ... + 2065066.

It is an arithmetic number, because the mean of its divisors is an integer number (12390336).

Almost surely, 2^45431221 is an apocalyptic number.

It is an amenable number.

45431221 is a deficient number, since it is larger than the sum of its proper divisors (4130123).

45431221 is a wasteful number, since it uses less digits than its factorization.

45431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130122.

The product of its digits is 960, while the sum is 22.

The square root of 45431221 is about 6740.2686148254. The cubic root of 45431221 is about 356.8218739103.

Adding to 45431221 its reverse (12213454), we get a palindrome (57644675).

The spelling of 45431221 in words is "forty-five million, four hundred thirty-one thousand, two hundred twenty-one".