1091378492 has 12 divisors (see below), whose sum is σ = 1961531880. Its totient is φ = 530940816.

The previous prime is 1091378471. The next prime is 1091378531. The reversal of 1091378492 is 2948731901.

It is a super-2 number, since 2×1091378492² = 2382214025600388128, which contains 22 as substring.

It is a congruent number.

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, 3686942 + ... + 3687237.

It is an arithmetic number, because the mean of its divisors is an integer number (163460990).

Almost surely, 2^1091378492 is an apocalyptic number.

It is an amenable number.

1091378492 is a deficient number, since it is larger than the sum of its proper divisors (870153388).

1091378492 is a wasteful number, since it uses less digits than its factorization.

1091378492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374220 (or 7374218 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1091378492 is about 33036.0181014601. The cubic root of 1091378492 is about 1029.5761262133.

The spelling of 1091378492 in words is "one billion, ninety-one million, three hundred seventy-eight thousand, four hundred ninety-two".