1091644495 has 8 divisors (see below), whose sum is σ = 1322216784. Its totient is φ = 865153344.

The previous prime is 1091644493. The next prime is 1091644501. The reversal of 1091644495 is 5944461901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1091644495 - 2¹ = 1091644493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091644493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1019694 + ... + 1020763.

It is an arithmetic number, because the mean of its divisors is an integer number (165277098).

Almost surely, 2^1091644495 is an apocalyptic number.

1091644495 is a deficient number, since it is larger than the sum of its proper divisors (230572289).

1091644495 is a wasteful number, since it uses less digits than its factorization.

1091644495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040569.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1091644495 is about 33040.0438105036. The cubic root of 1091644495 is about 1029.6597660300.

The spelling of 1091644495 in words is "one billion, ninety-one million, six hundred forty-four thousand, four hundred ninety-five".