1211206457 has 4 divisors (see below), whose sum is σ = 1231735440. Its totient is φ = 1190677476.

The previous prime is 1211206453. The next prime is 1211206501. The reversal of 1211206457 is 7546021121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211206457 - 2² = 1211206453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211206453) 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 in 3 ways as a sum of consecutive naturals, for example, 10264403 + ... + 10264520.

It is an arithmetic number, because the mean of its divisors is an integer number (307933860).

Almost surely, 2^1211206457 is an apocalyptic number.

It is an amenable number.

1211206457 is a deficient number, since it is larger than the sum of its proper divisors (20528983).

1211206457 is an equidigital number, since it uses as much as digits as its factorization.

1211206457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20528982.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1211206457 is about 34802.3915413869. The cubic root of 1211206457 is about 1065.9562798065.

Adding to 1211206457 its reverse (7546021121), we get a palindrome (8757227578).

The spelling of 1211206457 in words is "one billion, two hundred eleven million, two hundred six thousand, four hundred fifty-seven".