2149172257 has 2 divisors, whose sum is σ = 2149172258. Its totient is φ = 2149172256.

The previous prime is 2149172239. The next prime is 2149172323. The reversal of 2149172257 is 7522719412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2149156881 + 15376 = 46359^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149172257 - 2²³ = 2140783649 is a prime.

It is not a weakly prime, because it can be changed into another prime (2149172057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074586128 + 1074586129.

It is an arithmetic number, because the mean of its divisors is an integer number (1074586129).

Almost surely, 2^2149172257 is an apocalyptic number.

It is an amenable number.

2149172257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149172257 is an equidigital number, since it uses as much as digits as its factorization.

2149172257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 40.

The square root of 2149172257 is about 46359.1658358948. The cubic root of 2149172257 is about 1290.4972257444.

The spelling of 2149172257 in words is "two billion, one hundred forty-nine million, one hundred seventy-two thousand, two hundred fifty-seven".