1621641612 has 12 divisors (see below), whose sum is σ = 3783830456. Its totient is φ = 540547200.

The previous prime is 1621641607. The next prime is 1621641613. The reversal of 1621641612 is 2161461261.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1621641612.

It is not an unprimeable number, because it can be changed into a prime (1621641613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67568389 + ... + 67568412.

Almost surely, 2^1621641612 is an apocalyptic number.

1621641612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621641612 is an abundant number, since it is smaller than the sum of its proper divisors (2162188844).

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

1621641612 is a wasteful number, since it uses less digits than its factorization.

1621641612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135136808 (or 135136806 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 1621641612 is about 40269.6115203512. The cubic root of 1621641612 is about 1174.8568679130.

The spelling of 1621641612 in words is "one billion, six hundred twenty-one million, six hundred forty-one thousand, six hundred twelve".