1090431217 has 2 divisors, whose sum is σ = 1090431218. Its totient is φ = 1090431216.

The previous prime is 1090431193. The next prime is 1090431239. The reversal of 1090431217 is 7121340901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 752459761 + 337971456 = 27431^2 + 18384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1090431217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1090431247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545215608 + 545215609.

It is an arithmetic number, because the mean of its divisors is an integer number (545215609).

Almost surely, 2^1090431217 is an apocalyptic number.

It is an amenable number.

1090431217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090431217 is an equidigital number, since it uses as much as digits as its factorization.

1090431217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1090431217 is about 33021.6779858323. The cubic root of 1090431217 is about 1029.2781623568.

The spelling of 1090431217 in words is "one billion, ninety million, four hundred thirty-one thousand, two hundred seventeen".