1691842690 has 16 divisors (see below), whose sum is σ = 3053152440. Its totient is φ = 674995840.

The previous prime is 1691842673. The next prime is 1691842699. The reversal of 1691842690 is 962481961.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 780587721 + 911254969 = 27939^2 + 30187^2 .

It is a super-2 number, since 2×1691842690² = 5724663375412872200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1691842690.

It is not an unprimeable number, because it can be changed into a prime (1691842699) 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, 213571 + ... + 221350.

Almost surely, 2^1691842690 is an apocalyptic number.

1691842690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1691842690 is a deficient number, since it is larger than the sum of its proper divisors (1361309750).

1691842690 is a wasteful number, since it uses less digits than its factorization.

1691842690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435317.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1691842690 is about 41132.0153894749. The cubic root of 1691842690 is about 1191.5711868557.

The spelling of 1691842690 in words is "one billion, six hundred ninety-one million, eight hundred forty-two thousand, six hundred ninety".