1997855053 has 6 divisors (see below), whose sum is σ = 2017450734. Its totient is φ = 1978447896.

The previous prime is 1997855051. The next prime is 1997855059. The reversal of 1997855053 is 3505587991.

It can be written as a sum of positive squares in only one way, i.e., 1329477444 + 668377609 = 36462^2 + 25853^2 .

It is not a de Polignac number, because 1997855053 - 2¹ = 1997855051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997855051) 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 in 5 ways as a sum of consecutive naturals, for example, 83550 + ... + 104767.

It is an arithmetic number, because the mean of its divisors is an integer number (336241789).

Almost surely, 2^1997855053 is an apocalyptic number.

It is an amenable number.

1997855053 is a deficient number, since it is larger than the sum of its proper divisors (19595681).

1997855053 is an equidigital number, since it uses as much as digits as its factorization.

1997855053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188523 (or 188420 counting only the distinct ones).

The product of its (nonzero) digits is 1701000, while the sum is 52.

The square root of 1997855053 is about 44697.3718802347. The cubic root of 1997855053 is about 1259.4704781350.

The spelling of 1997855053 in words is "one billion, nine hundred ninety-seven million, eight hundred fifty-five thousand, fifty-three".