1621116899 has 8 divisors (see below), whose sum is σ = 1662891120. Its totient is φ = 1579527936.

The previous prime is 1621116881. The next prime is 1621116911. The reversal of 1621116899 is 9986111261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1621116899 - 2²⁸ = 1352681443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621116859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28502 + ... + 63675.

It is an arithmetic number, because the mean of its divisors is an integer number (207861390).

Almost surely, 2^1621116899 is an apocalyptic number.

1621116899 is a deficient number, since it is larger than the sum of its proper divisors (41774221).

1621116899 is an equidigital number, since it uses as much as digits as its factorization.

1621116899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92629.

The product of its digits is 46656, while the sum is 44.

The square root of 1621116899 is about 40263.0959937261. The cubic root of 1621116899 is about 1174.7301384785.

The spelling of 1621116899 in words is "one billion, six hundred twenty-one million, one hundred sixteen thousand, eight hundred ninety-nine".