1181952257 has 2 divisors, whose sum is σ = 1181952258. Its totient is φ = 1181952256.

The previous prime is 1181952241. The next prime is 1181952301. The reversal of 1181952257 is 7522591811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718454416 + 463497841 = 26804^2 + 21529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181952257 - 2⁴ = 1181952241 is a prime.

It is a super-2 number, since 2×1181952257² = 2794022275654788098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1183952257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590976128 + 590976129.

It is an arithmetic number, because the mean of its divisors is an integer number (590976129).

Almost surely, 2^1181952257 is an apocalyptic number.

It is an amenable number.

1181952257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181952257 is an equidigital number, since it uses as much as digits as its factorization.

1181952257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 41.

The square root of 1181952257 is about 34379.5325302716. The cubic root of 1181952257 is about 1057.3042504216.

The spelling of 1181952257 in words is "one billion, one hundred eighty-one million, nine hundred fifty-two thousand, two hundred fifty-seven".