1991622330 has 40 divisors (see below), whose sum is σ = 5355253332. Its totient is φ = 531099072.

The previous prime is 1991622329. The next prime is 1991622343. The reversal of 1991622330 is 332261991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1802257209 + 189365121 = 42453^2 + 13761^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1228587 + ... + 1230206.

Almost surely, 2^1991622330 is an apocalyptic number.

1991622330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1991622330 is an abundant number, since it is smaller than the sum of its proper divisors (3363631002).

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

1991622330 is a wasteful number, since it uses less digits than its factorization.

1991622330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458812 (or 2458803 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 1991622330 is about 44627.5960589409. The cubic root of 1991622330 is about 1258.1593873655.

The spelling of 1991622330 in words is "one billion, nine hundred ninety-one million, six hundred twenty-two thousand, three hundred thirty".