45231821 has 4 divisors (see below), whose sum is σ = 46690944. Its totient is φ = 43772700.

The previous prime is 45231817. The next prime is 45231827. The reversal of 45231821 is 12813254.

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 45231821 - 2² = 45231817 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 (45231827) 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, 729515 + ... + 729576.

It is an arithmetic number, because the mean of its divisors is an integer number (11672736).

Almost surely, 2^45231821 is an apocalyptic number.

It is an amenable number.

45231821 is a deficient number, since it is larger than the sum of its proper divisors (1459123).

45231821 is a wasteful number, since it uses less digits than its factorization.

45231821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459122.

The product of its digits is 1920, while the sum is 26.

The square root of 45231821 is about 6725.4606533679. The cubic root of 45231821 is about 356.2990716850.

The spelling of 45231821 in words is "forty-five million, two hundred thirty-one thousand, eight hundred twenty-one".