1091693990 has 8 divisors (see below), whose sum is σ = 1965049200. Its totient is φ = 436677592.

The previous prime is 1091693989. The next prime is 1091694031. The reversal of 1091693990 is 993961901.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54584690 + ... + 54584709.

It is an arithmetic number, because the mean of its divisors is an integer number (245631150).

Almost surely, 2^1091693990 is an apocalyptic number.

1091693990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1091693990 is a deficient number, since it is larger than the sum of its proper divisors (873355210).

1091693990 is a wasteful number, since it uses less digits than its factorization.

1091693990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109169406.

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 1091693990 is about 33040.7928173644. The cubic root of 1091693990 is about 1029.6753273353.

The spelling of 1091693990 in words is "one billion, ninety-one million, six hundred ninety-three thousand, nine hundred ninety".