1897543157 has 2 divisors, whose sum is σ = 1897543158. Its totient is φ = 1897543156.

The previous prime is 1897543103. The next prime is 1897543163. The reversal of 1897543157 is 7513457981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1818937201 + 78605956 = 42649^2 + 8866^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897543157 - 2¹⁴ = 1897526773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1897543057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948771578 + 948771579.

It is an arithmetic number, because the mean of its divisors is an integer number (948771579).

Almost surely, 2^1897543157 is an apocalyptic number.

It is an amenable number.

1897543157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897543157 is an equidigital number, since it uses as much as digits as its factorization.

1897543157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 50.

The square root of 1897543157 is about 43560.7983971828. The cubic root of 1897543157 is about 1238.0282479246.

The spelling of 1897543157 in words is "one billion, eight hundred ninety-seven million, five hundred forty-three thousand, one hundred fifty-seven".