1731642397 has 6 divisors (see below), whose sum is σ = 1747115162. Its totient is φ = 1716305472.

The previous prime is 1731642391. The next prime is 1731642433. The reversal of 1731642397 is 7932461371.

It can be written as a sum of positive squares in 3 ways, for example, as 2247001 + 1729395396 = 1499^2 + 41586^2 .

It is not a de Polignac number, because 1731642397 - 2²³ = 1723253789 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 (1731642391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55038 + ... + 80575.

Almost surely, 2^1731642397 is an apocalyptic number.

It is an amenable number.

1731642397 is a deficient number, since it is larger than the sum of its proper divisors (15472765).

1731642397 is an equidigital number, since it uses as much as digits as its factorization.

1731642397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135839 (or 135726 counting only the distinct ones).

The product of its digits is 190512, while the sum is 43.

The square root of 1731642397 is about 41613.0075457182. The cubic root of 1731642397 is about 1200.8425557318.

It can be divided in two parts, 173164 and 2397, that added together give a square (175561 = 419²).

The spelling of 1731642397 in words is "one billion, seven hundred thirty-one million, six hundred forty-two thousand, three hundred ninety-seven".