2638449191 has 4 divisors (see below), whose sum is σ = 3015370512. Its totient is φ = 2261527872.

The previous prime is 2638449173. The next prime is 2638449197. The reversal of 2638449191 is 1919448362.

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 2638449191 - 2¹⁴ = 2638432807 is a prime.

It is a super-2 number, since 2×2638449191² = 13922828266977108962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638449197) 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, 188460650 + ... + 188460663.

It is an arithmetic number, because the mean of its divisors is an integer number (753842628).

Almost surely, 2^2638449191 is an apocalyptic number.

2638449191 is a deficient number, since it is larger than the sum of its proper divisors (376921321).

2638449191 is an equidigital number, since it uses as much as digits as its factorization.

2638449191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376921320.

The product of its digits is 373248, while the sum is 47.

The square root of 2638449191 is about 51365.8368081354. The cubic root of 2638449191 is about 1381.8139680815.

The spelling of 2638449191 in words is "two billion, six hundred thirty-eight million, four hundred forty-nine thousand, one hundred ninety-one".