1213432655 has 8 divisors (see below), whose sum is σ = 1471131312. Its totient is φ = 960738048.

The previous prime is 1213432639. The next prime is 1213432657. The reversal of 1213432655 is 5562343121.

It is a happy number.

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 1213432655 - 2⁴ = 1213432639 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 (1213432657) 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, 1250477 + ... + 1251446.

It is an arithmetic number, because the mean of its divisors is an integer number (183891414).

Almost surely, 2^1213432655 is an apocalyptic number.

1213432655 is a deficient number, since it is larger than the sum of its proper divisors (257698657).

1213432655 is an equidigital number, since it uses as much as digits as its factorization.

1213432655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502025.

The product of its digits is 21600, while the sum is 32.

The square root of 1213432655 is about 34834.3602639693. The cubic root of 1213432655 is about 1066.6089561333.

Adding to 1213432655 its reverse (5562343121), we get a palindrome (6775775776).

The spelling of 1213432655 in words is "one billion, two hundred thirteen million, four hundred thirty-two thousand, six hundred fifty-five".