1997491233 has 4 divisors (see below), whose sum is σ = 2663321648. Its totient is φ = 1331660820.

The previous prime is 1997491229. The next prime is 1997491277. The reversal of 1997491233 is 3321947991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1997491233 - 2² = 1997491229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997491633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332915203 + ... + 332915208.

It is an arithmetic number, because the mean of its divisors is an integer number (665830412).

Almost surely, 2^1997491233 is an apocalyptic number.

It is an amenable number.

1997491233 is a deficient number, since it is larger than the sum of its proper divisors (665830415).

1997491233 is an equidigital number, since it uses as much as digits as its factorization.

1997491233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665830414.

The product of its digits is 367416, while the sum is 48.

The square root of 1997491233 is about 44693.3018807069. The cubic root of 1997491233 is about 1259.3940214094.

The spelling of 1997491233 in words is "one billion, nine hundred ninety-seven million, four hundred ninety-one thousand, two hundred thirty-three".