109290781 has 2 divisors, whose sum is σ = 109290782. Its totient is φ = 109290780.

The previous prime is 109290767. The next prime is 109290817. The reversal of 109290781 is 187092901.

Together with next prime (109290817) 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., 82973881 + 26316900 = 9109^2 + 5130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109290781 is a prime.

It is a super-2 number, since 2×109290781² = 23888949623179922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 109290781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109290721) 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, 54645390 + 54645391.

It is an arithmetic number, because the mean of its divisors is an integer number (54645391).

Almost surely, 2^109290781 is an apocalyptic number.

It is an amenable number.

109290781 is a deficient number, since it is larger than the sum of its proper divisors (1).

109290781 is an equidigital number, since it uses as much as digits as its factorization.

109290781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 109290781 is about 10454.2231179557. The cubic root of 109290781 is about 478.1100173926.

The spelling of 109290781 in words is "one hundred nine million, two hundred ninety thousand, seven hundred eighty-one".