1091798413 has 2 divisors, whose sum is σ = 1091798414. Its totient is φ = 1091798412.

The previous prime is 1091798399. The next prime is 1091798419. The reversal of 1091798413 is 3148971901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091773764 + 24649 = 33042^2 + 157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091798413 - 2⁹ = 1091797901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1091798413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091798419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545899206 + 545899207.

It is an arithmetic number, because the mean of its divisors is an integer number (545899207).

Almost surely, 2^1091798413 is an apocalyptic number.

It is an amenable number.

1091798413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091798413 is an equidigital number, since it uses as much as digits as its factorization.

1091798413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1091798413 is about 33042.3729928708. The cubic root of 1091798413 is about 1029.7081565468.

The spelling of 1091798413 in words is "one billion, ninety-one million, seven hundred ninety-eight thousand, four hundred thirteen".