2543159621 has 4 divisors (see below), whose sum is σ = 2602302912. Its totient is φ = 2484016332.

The previous prime is 2543159609. The next prime is 2543159623. The reversal of 2543159621 is 1269513452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2543159621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543159623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29571581 + ... + 29571666.

It is an arithmetic number, because the mean of its divisors is an integer number (650575728).

Almost surely, 2^2543159621 is an apocalyptic number.

It is an amenable number.

2543159621 is a deficient number, since it is larger than the sum of its proper divisors (59143291).

2543159621 is an equidigital number, since it uses as much as digits as its factorization.

2543159621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59143290.

The product of its digits is 64800, while the sum is 38.

The square root of 2543159621 is about 50429.7493648342. The cubic root of 2543159621 is about 1364.9745053761.

The spelling of 2543159621 in words is "two billion, five hundred forty-three million, one hundred fifty-nine thousand, six hundred twenty-one".