1231996573 has 4 divisors (see below), whose sum is σ = 1234185408. Its totient is φ = 1229807740.

The previous prime is 1231996561. The next prime is 1231996583. The reversal of 1231996573 is 3756991321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3756991321 = 59 ⋅63677819.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231996573 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 (1231996583) 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 3 ways as a sum of consecutive naturals, for example, 1093573 + ... + 1094698.

It is an arithmetic number, because the mean of its divisors is an integer number (308546352).

Almost surely, 2^1231996573 is an apocalyptic number.

It is an amenable number.

1231996573 is a deficient number, since it is larger than the sum of its proper divisors (2188835).

1231996573 is an equidigital number, since it uses as much as digits as its factorization.

1231996573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188834.

The product of its digits is 306180, while the sum is 46.

The square root of 1231996573 is about 35099.8087316726. The cubic root of 1231996573 is about 1072.0206881937.

The spelling of 1231996573 in words is "one billion, two hundred thirty-one million, nine hundred ninety-six thousand, five hundred seventy-three".