1090402217 has 4 divisors (see below), whose sum is σ = 1090520580. Its totient is φ = 1090283856.

The previous prime is 1090402207. The next prime is 1090402223. The reversal of 1090402217 is 7122040901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98089216 + 992313001 = 9904^2 + 31501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1090402217 - 2¹⁴ = 1090385833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1090402207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44078 + ... + 64215.

It is an arithmetic number, because the mean of its divisors is an integer number (272630145).

Almost surely, 2^1090402217 is an apocalyptic number.

It is an amenable number.

1090402217 is a deficient number, since it is larger than the sum of its proper divisors (118363).

1090402217 is a wasteful number, since it uses less digits than its factorization.

1090402217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118362.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1090402217 is about 33021.2388774255. The cubic root of 1090402217 is about 1029.2690377307.

The spelling of 1090402217 in words is "one billion, ninety million, four hundred two thousand, two hundred seventeen".