1121256571 has 2 divisors, whose sum is σ = 1121256572. Its totient is φ = 1121256570.

The previous prime is 1121256569. The next prime is 1121256611. The reversal of 1121256571 is 1756521211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121256571 - 2¹ = 1121256569 is a prime.

Together with 1121256569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1121256541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560628285 + 560628286.

It is an arithmetic number, because the mean of its divisors is an integer number (560628286).

Almost surely, 2^1121256571 is an apocalyptic number.

1121256571 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121256571 is an equidigital number, since it uses as much as digits as its factorization.

1121256571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 31.

The square root of 1121256571 is about 33485.1694187143. The cubic root of 1121256571 is about 1038.8870524481.

Adding to 1121256571 its reverse (1756521211), we get a palindrome (2877777782).

The spelling of 1121256571 in words is "one billion, one hundred twenty-one million, two hundred fifty-six thousand, five hundred seventy-one".