2447172557 has 2 divisors, whose sum is σ = 2447172558. Its totient is φ = 2447172556.

The previous prime is 2447172499. The next prime is 2447172601. The reversal of 2447172557 is 7552717442.

It is an a-pointer prime, because the next prime (2447172601) can be obtained adding 2447172557 to its sum of digits (44).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1973936041 + 473236516 = 44429^2 + 21754^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2447172557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2447172157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1223586278 + 1223586279.

It is an arithmetic number, because the mean of its divisors is an integer number (1223586279).

Almost surely, 2^2447172557 is an apocalyptic number.

It is an amenable number.

2447172557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2447172557 is an equidigital number, since it uses as much as digits as its factorization.

2447172557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 548800, while the sum is 44.

The square root of 2447172557 is about 49468.9049504838. The cubic root of 2447172557 is about 1347.5809549981.

Adding to 2447172557 its reverse (7552717442), we get a palindrome (9999889999).

The spelling of 2447172557 in words is "two billion, four hundred forty-seven million, one hundred seventy-two thousand, five hundred fifty-seven".