1090891471 has 4 divisors (see below), whose sum is σ = 1091727432. Its totient is φ = 1090055512.

The previous prime is 1090891433. The next prime is 1090891481. The reversal of 1090891471 is 1741980901.

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

It is a cyclic number.

It is not a de Polignac number, because 1090891471 - 2¹⁹ = 1090367183 is a prime.

It is a super-3 number, since 3×1090891471³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090891481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416020 + ... + 418633.

It is an arithmetic number, because the mean of its divisors is an integer number (272931858).

Almost surely, 2^1090891471 is an apocalyptic number.

1090891471 is a deficient number, since it is larger than the sum of its proper divisors (835961).

1090891471 is an equidigital number, since it uses as much as digits as its factorization.

1090891471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835960.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 1090891471 is about 33028.6462180938. The cubic root of 1090891471 is about 1029.4229560703.

The spelling of 1090891471 in words is "one billion, ninety million, eight hundred ninety-one thousand, four hundred seventy-one".