1621034911 has 4 divisors (see below), whose sum is σ = 1623884400. Its totient is φ = 1618185424.

The previous prime is 1621034869. The next prime is 1621034929. The reversal of 1621034911 is 1194301261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1621034911 - 2⁹ = 1621034399 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 1621034911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621034011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1423891 + ... + 1425028.

It is an arithmetic number, because the mean of its divisors is an integer number (405971100).

Almost surely, 2^1621034911 is an apocalyptic number.

1621034911 is a deficient number, since it is larger than the sum of its proper divisors (2849489).

1621034911 is an equidigital number, since it uses as much as digits as its factorization.

1621034911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849488.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1621034911 is about 40262.0778276532. The cubic root of 1621034911 is about 1174.7103341493.

The spelling of 1621034911 in words is "one billion, six hundred twenty-one million, thirty-four thousand, nine hundred eleven".