1213011257 has 2 divisors, whose sum is σ = 1213011258. Its totient is φ = 1213011256.

The previous prime is 1213011253. The next prime is 1213011259. The reversal of 1213011257 is 7521103121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1182053161 + 30958096 = 34381^2 + 5564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213011257 - 2² = 1213011253 is a prime.

Together with 1213011259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1213011253) 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 as a sum of consecutive naturals, namely, 606505628 + 606505629.

It is an arithmetic number, because the mean of its divisors is an integer number (606505629).

Almost surely, 2^1213011257 is an apocalyptic number.

It is an amenable number.

1213011257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213011257 is an equidigital number, since it uses as much as digits as its factorization.

1213011257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1213011257 is about 34828.3111419431. The cubic root of 1213011257 is about 1066.4854720325.

Adding to 1213011257 its reverse (7521103121), we get a palindrome (8734114378).

The spelling of 1213011257 in words is "one billion, two hundred thirteen million, eleven thousand, two hundred fifty-seven".