1997161057 has 2 divisors, whose sum is σ = 1997161058. Its totient is φ = 1997161056.

The previous prime is 1997161051. The next prime is 1997161069. The reversal of 1997161057 is 7501617991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865462481 + 131698576 = 43191^2 + 11476^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997161057 - 2¹¹ = 1997159009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1997160998 and 1997161016.

It is not a weakly prime, because it can be changed into another prime (1997161051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998580528 + 998580529.

It is an arithmetic number, because the mean of its divisors is an integer number (998580529).

Almost surely, 2^1997161057 is an apocalyptic number.

It is an amenable number.

1997161057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997161057 is an equidigital number, since it uses as much as digits as its factorization.

1997161057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 46.

The square root of 1997161057 is about 44689.6079307035. The cubic root of 1997161057 is about 1259.3246269298.

The spelling of 1997161057 in words is "one billion, nine hundred ninety-seven million, one hundred sixty-one thousand, fifty-seven".