2049557817 has 4 divisors (see below), whose sum is σ = 2732743760. Its totient is φ = 1366371876.

The previous prime is 2049557813. The next prime is 2049557833. The reversal of 2049557817 is 7187559402.

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 not a de Polignac number, because 2049557817 - 2² = 2049557813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2049557813) 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, 341592967 + ... + 341592972.

It is an arithmetic number, because the mean of its divisors is an integer number (683185940).

Almost surely, 2^2049557817 is an apocalyptic number.

It is an amenable number.

2049557817 is a deficient number, since it is larger than the sum of its proper divisors (683185943).

2049557817 is an equidigital number, since it uses as much as digits as its factorization.

2049557817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683185942.

The product of its (nonzero) digits is 705600, while the sum is 48.

The square root of 2049557817 is about 45272.0423329896. The cubic root of 2049557817 is about 1270.2427495965.

The spelling of 2049557817 in words is "two billion, forty-nine million, five hundred fifty-seven thousand, eight hundred seventeen".