45097781 has 2 divisors, whose sum is σ = 45097782. Its totient is φ = 45097780.

The previous prime is 45097763. The next prime is 45097817. The reversal of 45097781 is 18779054.

Together with next prime (45097817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36300625 + 8797156 = 6025^2 + 2966^2 .

It is a cyclic number.

It is not a de Polignac number, because 45097781 - 2¹⁰ = 45096757 is a prime.

It is a super-2 number, since 2×45097781² = 4067619702247922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45097711) 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, 22548890 + 22548891.

It is an arithmetic number, because the mean of its divisors is an integer number (22548891).

Almost surely, 2^45097781 is an apocalyptic number.

It is an amenable number.

45097781 is a deficient number, since it is larger than the sum of its proper divisors (1).

45097781 is an equidigital number, since it uses as much as digits as its factorization.

45097781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 45097781 is about 6715.4881430913. The cubic root of 45097781 is about 355.9467711731.

The spelling of 45097781 in words is "forty-five million, ninety-seven thousand, seven hundred eighty-one".