1181516213 has 2 divisors, whose sum is σ = 1181516214. Its totient is φ = 1181516212.

The previous prime is 1181516143. The next prime is 1181516251. The reversal of 1181516213 is 3126151811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650352004 + 531164209 = 25502^2 + 23047^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181516213 - 2¹² = 1181512117 is a prime.

It is a super-2 number, since 2×1181516213² = 2791961123163722738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1181516293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590758106 + 590758107.

It is an arithmetic number, because the mean of its divisors is an integer number (590758107).

Almost surely, 2^1181516213 is an apocalyptic number.

It is an amenable number.

1181516213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181516213 is an equidigital number, since it uses as much as digits as its factorization.

1181516213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 29.

The square root of 1181516213 is about 34373.1903232737. The cubic root of 1181516213 is about 1057.1742147460.

The spelling of 1181516213 in words is "one billion, one hundred eighty-one million, five hundred sixteen thousand, two hundred thirteen".