1231663613 has 8 divisors (see below), whose sum is σ = 1264098240. Its totient is φ = 1199642400.

The previous prime is 1231663579. The next prime is 1231663621. The reversal of 1231663613 is 3163661321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231663613 - 2¹⁶ = 1231598077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231663613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231663673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97313 + ... + 109238.

It is an arithmetic number, because the mean of its divisors is an integer number (158012280).

Almost surely, 2^1231663613 is an apocalyptic number.

It is an amenable number.

1231663613 is a deficient number, since it is larger than the sum of its proper divisors (32434627).

1231663613 is an equidigital number, since it uses as much as digits as its factorization.

1231663613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206707.

The product of its digits is 11664, while the sum is 32.

The square root of 1231663613 is about 35095.0653653758. The cubic root of 1231663613 is about 1071.9241045460.

The spelling of 1231663613 in words is "one billion, two hundred thirty-one million, six hundred sixty-three thousand, six hundred thirteen".