1091900345 has 4 divisors (see below), whose sum is σ = 1310280420. Its totient is φ = 873520272.

The previous prime is 1091900297. The next prime is 1091900351. The reversal of 1091900345 is 5430091901.

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 414651769 + 677248576 = 20363^2 + 26024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091900345 - 2¹² = 1091896249 is a prime.

It is a super-2 number, since 2×1091900345² = 2384492726822238050, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 109190030 + ... + 109190039.

It is an arithmetic number, because the mean of its divisors is an integer number (327570105).

Almost surely, 2^1091900345 is an apocalyptic number.

It is an amenable number.

1091900345 is a deficient number, since it is larger than the sum of its proper divisors (218380075).

1091900345 is an equidigital number, since it uses as much as digits as its factorization.

1091900345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218380074.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 1091900345 is about 33043.9154005696. The cubic root of 1091900345 is about 1029.7402006019.

The spelling of 1091900345 in words is "one billion, ninety-one million, nine hundred thousand, three hundred forty-five".