1161323257 has 2 divisors, whose sum is σ = 1161323258. Its totient is φ = 1161323256.

The previous prime is 1161323243. The next prime is 1161323281. The reversal of 1161323257 is 7523231611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1053391936 + 107931321 = 32456^2 + 10389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161323257 - 2⁷ = 1161323129 is a prime.

It is a super-3 number, since 3×1161323257³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1161323557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580661628 + 580661629.

It is an arithmetic number, because the mean of its divisors is an integer number (580661629).

Almost surely, 2^1161323257 is an apocalyptic number.

It is an amenable number.

1161323257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161323257 is an equidigital number, since it uses as much as digits as its factorization.

1161323257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 1161323257 is about 34078.1932766395. The cubic root of 1161323257 is about 1051.1169541071.

Adding to 1161323257 its reverse (7523231611), we get a palindrome (8684554868).

The spelling of 1161323257 in words is "one billion, one hundred sixty-one million, three hundred twenty-three thousand, two hundred fifty-seven".