1231241565 has 8 divisors (see below), whose sum is σ = 1969986528. Its totient is φ = 656662160.

The previous prime is 1231241551. The next prime is 1231241573. The reversal of 1231241565 is 5651421321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231241565 - 2⁵ = 1231241533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41041371 + ... + 41041400.

It is an arithmetic number, because the mean of its divisors is an integer number (246248316).

Almost surely, 2^1231241565 is an apocalyptic number.

1231241565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231241565 is a deficient number, since it is larger than the sum of its proper divisors (738744963).

1231241565 is an equidigital number, since it uses as much as digits as its factorization.

1231241565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82082779.

The product of its digits is 7200, while the sum is 30.

The square root of 1231241565 is about 35089.0519250663. The cubic root of 1231241565 is about 1071.8016536041.

Adding to 1231241565 its reverse (5651421321), we get a palindrome (6882662886).

The spelling of 1231241565 in words is "one billion, two hundred thirty-one million, two hundred forty-one thousand, five hundred sixty-five".