1213827757 has 2 divisors, whose sum is σ = 1213827758. Its totient is φ = 1213827756.

The previous prime is 1213827733. The next prime is 1213827767. The reversal of 1213827757 is 7577283121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819447876 + 394379881 = 28626^2 + 19859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213827757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213827767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606913878 + 606913879.

It is an arithmetic number, because the mean of its divisors is an integer number (606913879).

Almost surely, 2^1213827757 is an apocalyptic number.

It is an amenable number.

1213827757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213827757 is an equidigital number, since it uses as much as digits as its factorization.

1213827757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164640, while the sum is 43.

The square root of 1213827757 is about 34840.0309557842. The cubic root of 1213827757 is about 1066.7247086363.

The spelling of 1213827757 in words is "one billion, two hundred thirteen million, eight hundred twenty-seven thousand, seven hundred fifty-seven".