1213232665 has 4 divisors (see below), whose sum is σ = 1455879204. Its totient is φ = 970586128.

The previous prime is 1213232653. The next prime is 1213232677. The reversal of 1213232665 is 5662323121.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1213232653) and next prime (1213232677).

It can be written as a sum of positive squares in 2 ways, for example, as 849605904 + 363626761 = 29148^2 + 19069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213232665 - 2⁵ = 1213232633 is a prime.

It is a Duffinian 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, 121323262 + ... + 121323271.

It is an arithmetic number, because the mean of its divisors is an integer number (363969801).

Almost surely, 2^1213232665 is an apocalyptic number.

It is an amenable number.

1213232665 is a deficient number, since it is larger than the sum of its proper divisors (242646539).

1213232665 is an equidigital number, since it uses as much as digits as its factorization.

1213232665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242646538.

The product of its digits is 12960, while the sum is 31.

The square root of 1213232665 is about 34831.4895604538. The cubic root of 1213232665 is about 1066.5503557531.

Adding to 1213232665 its reverse (5662323121), we get a palindrome (6875555786).

The spelling of 1213232665 in words is "one billion, two hundred thirteen million, two hundred thirty-two thousand, six hundred sixty-five".