45981781 has 2 divisors, whose sum is σ = 45981782. Its totient is φ = 45981780.

The previous prime is 45981769. The next prime is 45981857. The reversal of 45981781 is 18718954.

It is a happy number.

45981781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23571025 + 22410756 = 4855^2 + 4734^2 .

It is a cyclic number.

It is not a de Polignac number, because 45981781 - 2²¹ = 43884629 is a prime.

It is a super-2 number, since 2×45981781² = 4228648367863922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45981281) 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 as a sum of consecutive naturals, namely, 22990890 + 22990891.

It is an arithmetic number, because the mean of its divisors is an integer number (22990891).

Almost surely, 2^45981781 is an apocalyptic number.

It is an amenable number.

45981781 is a deficient number, since it is larger than the sum of its proper divisors (1).

45981781 is an equidigital number, since it uses as much as digits as its factorization.

45981781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 45981781 is about 6780.9867276083. The cubic root of 45981781 is about 358.2574768339.

The spelling of 45981781 in words is "forty-five million, nine hundred eighty-one thousand, seven hundred eighty-one".