1783231997 has 4 divisors (see below), whose sum is σ = 1783465596. Its totient is φ = 1782998400.

The previous prime is 1783231993. The next prime is 1783232027. The reversal of 1783231997 is 7991323871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7991323871 = 31 ⋅257784641.

It can be written as a sum of positive squares in 2 ways, for example, as 1111955716 + 671276281 = 33346^2 + 25909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1783231997 - 2² = 1783231993 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 (1783231991) 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, 104948 + ... + 120749.

It is an arithmetic number, because the mean of its divisors is an integer number (445866399).

Almost surely, 2^1783231997 is an apocalyptic number.

It is an amenable number.

1783231997 is a deficient number, since it is larger than the sum of its proper divisors (233599).

1783231997 is an equidigital number, since it uses as much as digits as its factorization.

1783231997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233598.

The product of its digits is 571536, while the sum is 50.

The square root of 1783231997 is about 42228.3316862033. The cubic root of 1783231997 is about 1212.6513355160.

The spelling of 1783231997 in words is "one billion, seven hundred eighty-three million, two hundred thirty-one thousand, nine hundred ninety-seven".