1231745605 has 4 divisors (see below), whose sum is σ = 1478094732. Its totient is φ = 985396480.

The previous prime is 1231745597. The next prime is 1231745617. The reversal of 1231745605 is 5065471321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 549386721 + 682358884 = 23439^2 + 26122^2 .

It is not a de Polignac number, because 1231745605 - 2³ = 1231745597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123174556 + ... + 123174565.

It is an arithmetic number, because the mean of its divisors is an integer number (369523683).

Almost surely, 2^1231745605 is an apocalyptic number.

It is an amenable number.

1231745605 is a deficient number, since it is larger than the sum of its proper divisors (246349127).

1231745605 is an equidigital number, since it uses as much as digits as its factorization.

1231745605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246349126.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 1231745605 is about 35096.2334873701. The cubic root of 1231745605 is about 1071.9478900586.

The spelling of 1231745605 in words is "one billion, two hundred thirty-one million, seven hundred forty-five thousand, six hundred five".