1121178257 has 2 divisors, whose sum is σ = 1121178258. Its totient is φ = 1121178256.

The previous prime is 1121178241. The next prime is 1121178287. The reversal of 1121178257 is 7528711211.

It is a Cunningham number, because it is equal to 33484²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121178256 + 1 = 33484^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121178257 - 2⁴ = 1121178241 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121178287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560589128 + 560589129.

It is an arithmetic number, because the mean of its divisors is an integer number (560589129).

Almost surely, 2^1121178257 is an apocalyptic number.

It is an amenable number.

1121178257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121178257 is an equidigital number, since it uses as much as digits as its factorization.

1121178257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 35.

The square root of 1121178257 is about 33484.0000149325. Note that the first 4 decimals coincide. The cubic root of 1121178257 is about 1038.8628649139.

Adding to 1121178257 its reverse (7528711211), we get a palindrome (8649889468).

The spelling of 1121178257 in words is "one billion, one hundred twenty-one million, one hundred seventy-eight thousand, two hundred fifty-seven".