2638449173 has 2 divisors, whose sum is σ = 2638449174. Its totient is φ = 2638449172.

The previous prime is 2638449167. The next prime is 2638449197. The reversal of 2638449173 is 3719448362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1477479844 + 1160969329 = 38438^2 + 34073^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638449173 - 2⁴ = 2638449157 is a prime.

It is a super-2 number, since 2×2638449173² = 13922828077008767858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638449103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319224586 + 1319224587.

It is an arithmetic number, because the mean of its divisors is an integer number (1319224587).

Almost surely, 2^2638449173 is an apocalyptic number.

It is an amenable number.

2638449173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638449173 is an equidigital number, since it uses as much as digits as its factorization.

2638449173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 2638449173 is about 51365.8366329217. The cubic root of 2638449173 is about 1381.8139649392.

It can be divided in two parts, 26384 and 49173, that added together give a palindrome (75557).

The spelling of 2638449173 in words is "two billion, six hundred thirty-eight million, four hundred forty-nine thousand, one hundred seventy-three".