1997537271 has 16 divisors (see below), whose sum is σ = 2750630400. Its totient is φ = 1288705088.

The previous prime is 1997537249. The next prime is 1997537287. The reversal of 1997537271 is 1727357991.

It is a cyclic number.

It is not a de Polignac number, because 1997537271 - 2⁵ = 1997537239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997537221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67041 + ... + 92138.

It is an arithmetic number, because the mean of its divisors is an integer number (171914400).

Almost surely, 2^1997537271 is an apocalyptic number.

1997537271 is a deficient number, since it is larger than the sum of its proper divisors (753093129).

1997537271 is a wasteful number, since it uses less digits than its factorization.

1997537271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159318.

The product of its digits is 833490, while the sum is 51.

The square root of 1997537271 is about 44693.8169213595. The cubic root of 1997537271 is about 1259.4036968021.

The spelling of 1997537271 in words is "one billion, nine hundred ninety-seven million, five hundred thirty-seven thousand, two hundred seventy-one".