1213432657 has 2 divisors, whose sum is σ = 1213432658. Its totient is φ = 1213432656.

The previous prime is 1213432639. The next prime is 1213432669. The reversal of 1213432657 is 7562343121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931226256 + 282206401 = 30516^2 + 16799^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213432657 - 2¹¹ = 1213430609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213432637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606716328 + 606716329.

It is an arithmetic number, because the mean of its divisors is an integer number (606716329).

Almost surely, 2^1213432657 is an apocalyptic number.

It is an amenable number.

1213432657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213432657 is an equidigital number, since it uses as much as digits as its factorization.

1213432657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 1213432657 is about 34834.3602926765. The cubic root of 1213432657 is about 1066.6089567194.

Adding to 1213432657 its reverse (7562343121), we get a palindrome (8775775778).

The spelling of 1213432657 in words is "one billion, two hundred thirteen million, four hundred thirty-two thousand, six hundred fifty-seven".