1081591690 has 16 divisors (see below), whose sum is σ = 1962196992. Its totient is φ = 429229584.

The previous prime is 1081591681. The next prime is 1081591711. The reversal of 1081591690 is 961951801.

It is a super-2 number, since 2×1081591690² = 2339681167754112200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424554 + ... + 427093.

It is an arithmetic number, because the mean of its divisors is an integer number (122637312).

Almost surely, 2^1081591690 is an apocalyptic number.

1081591690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1081591690 is a deficient number, since it is larger than the sum of its proper divisors (880605302).

1081591690 is a wasteful number, since it uses less digits than its factorization.

1081591690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851781.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 1081591690 is about 32887.5613264346. The cubic root of 1081591690 is about 1026.4893486753.

The spelling of 1081591690 in words is "one billion, eighty-one million, five hundred ninety-one thousand, six hundred ninety".