1231665241 has 4 divisors (see below), whose sum is σ = 1235320372. Its totient is φ = 1228010112.

The previous prime is 1231665217. The next prime is 1231665263. The reversal of 1231665241 is 1425661321.

It is a happy number.

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 364657216 + 867008025 = 19096^2 + 29445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231665241 - 2¹¹ = 1231663193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231665041) 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, 1827060 + ... + 1827733.

It is an arithmetic number, because the mean of its divisors is an integer number (308830093).

Almost surely, 2^1231665241 is an apocalyptic number.

It is an amenable number.

1231665241 is a deficient number, since it is larger than the sum of its proper divisors (3655131).

1231665241 is an equidigital number, since it uses as much as digits as its factorization.

1231665241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655130.

The product of its digits is 8640, while the sum is 31.

The square root of 1231665241 is about 35095.0885595121. The cubic root of 1231665241 is about 1071.9245768318.

The spelling of 1231665241 in words is "one billion, two hundred thirty-one million, six hundred sixty-five thousand, two hundred forty-one".