2145522157 has 2 divisors, whose sum is σ = 2145522158. Its totient is φ = 2145522156.

The previous prime is 2145522151. The next prime is 2145522187. The reversal of 2145522157 is 7512255412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1471029316 + 674492841 = 38354^2 + 25971^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145522157 - 2³ = 2145522149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145522151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072761078 + 1072761079.

It is an arithmetic number, because the mean of its divisors is an integer number (1072761079).

Almost surely, 2^2145522157 is an apocalyptic number.

It is an amenable number.

2145522157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145522157 is an equidigital number, since it uses as much as digits as its factorization.

2145522157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28000, while the sum is 34.

The square root of 2145522157 is about 46319.7814869630. The cubic root of 2145522157 is about 1289.7662290972.

Adding to 2145522157 its reverse (7512255412), we get a palindrome (9657777569).

The spelling of 2145522157 in words is "two billion, one hundred forty-five million, five hundred twenty-two thousand, one hundred fifty-seven".