1091355690 has 32 divisors (see below), whose sum is σ = 2630511936. Its totient is φ = 289777280.

The previous prime is 1091355689. The next prime is 1091355709. The reversal of 1091355690 is 965531901.

It is a super-2 number, since 2×1091355690² = 2382114484190752200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71076 + ... + 85055.

It is an arithmetic number, because the mean of its divisors is an integer number (82203498).

Almost surely, 2^1091355690 is an apocalyptic number.

1091355690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1091355690 is an abundant number, since it is smaller than the sum of its proper divisors (1539156246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091355690 is a wasteful number, since it uses less digits than its factorization.

1091355690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156374.

The product of its (nonzero) digits is 36450, while the sum is 39.

The square root of 1091355690 is about 33035.6729914800. The cubic root of 1091355690 is about 1029.5689559057.

The spelling of 1091355690 in words is "one billion, ninety-one million, three hundred fifty-five thousand, six hundred ninety".