1230013661 has 4 divisors (see below), whose sum is σ = 1241298300. Its totient is φ = 1218729024.

The previous prime is 1230013657. The next prime is 1230013663. The reversal of 1230013661 is 1663100321.

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 538008025 + 692005636 = 23195^2 + 26306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230013661 - 2² = 1230013657 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 (1230013663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5642156 + ... + 5642373.

It is an arithmetic number, because the mean of its divisors is an integer number (310324575).

Almost surely, 2^1230013661 is an apocalyptic number.

It is an amenable number.

1230013661 is a deficient number, since it is larger than the sum of its proper divisors (11284639).

1230013661 is a wasteful number, since it uses less digits than its factorization.

1230013661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11284638.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1230013661 is about 35071.5505930377. The cubic root of 1230013661 is about 1071.4452363317.

Adding to 1230013661 its reverse (1663100321), we get a palindrome (2893113982).

The spelling of 1230013661 in words is "one billion, two hundred thirty million, thirteen thousand, six hundred sixty-one".