1621116901 has 8 divisors (see below), whose sum is σ = 1631257920. Its totient is φ = 1610988288.

The previous prime is 1621116881. The next prime is 1621116911. The reversal of 1621116901 is 1096111261.

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 1621116901 - 2⁵ = 1621116869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621116901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621116911) 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, 515205 + ... + 518341.

It is an arithmetic number, because the mean of its divisors is an integer number (203907240).

Almost surely, 2^1621116901 is an apocalyptic number.

It is an amenable number.

1621116901 is a deficient number, since it is larger than the sum of its proper divisors (10141019).

1621116901 is a wasteful number, since it uses less digits than its factorization.

1621116901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6203.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1621116901 is about 40263.0960185627. The cubic root of 1621116901 is about 1174.7301389616.

The spelling of 1621116901 in words is "one billion, six hundred twenty-one million, one hundred sixteen thousand, nine hundred one".