45318421 has 2 divisors, whose sum is σ = 45318422. Its totient is φ = 45318420.

The previous prime is 45318389. The next prime is 45318433. The reversal of 45318421 is 12481354.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45037521 + 280900 = 6711^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 45318421 - 2⁵ = 45318389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45318421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45318121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22659210 + 22659211.

It is an arithmetic number, because the mean of its divisors is an integer number (22659211).

Almost surely, 2^45318421 is an apocalyptic number.

It is an amenable number.

45318421 is a deficient number, since it is larger than the sum of its proper divisors (1).

45318421 is an equidigital number, since it uses as much as digits as its factorization.

45318421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 45318421 is about 6731.8957953908. The cubic root of 45318421 is about 356.5263145718.

Adding to 45318421 its reverse (12481354), we get a palindrome (57799775).

The spelling of 45318421 in words is "forty-five million, three hundred eighteen thousand, four hundred twenty-one".