2621608491 has 4 divisors (see below), whose sum is σ = 3495477992. Its totient is φ = 1747738992.

The previous prime is 2621608489. The next prime is 2621608499. The reversal of 2621608491 is 1948061262.

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

It is not a de Polignac number, because 2621608491 - 2¹ = 2621608489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621608499) 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 3 ways as a sum of consecutive naturals, for example, 436934746 + ... + 436934751.

It is an arithmetic number, because the mean of its divisors is an integer number (873869498).

Almost surely, 2^2621608491 is an apocalyptic number.

2621608491 is a deficient number, since it is larger than the sum of its proper divisors (873869501).

2621608491 is an equidigital number, since it uses as much as digits as its factorization.

2621608491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873869500.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 2621608491 is about 51201.6453934832. The cubic root of 2621608491 is about 1378.8677422355.

The spelling of 2621608491 in words is "two billion, six hundred twenty-one million, six hundred eight thousand, four hundred ninety-one".