1167965581 has 2 divisors, whose sum is σ = 1167965582. Its totient is φ = 1167965580.

The previous prime is 1167965567. The next prime is 1167965677. The reversal of 1167965581 is 1855697611.

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., 704424681 + 463540900 = 26541^2 + 21530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1167965581 - 2⁷ = 1167965453 is a prime.

It is a super-2 number, since 2×1167965581² = 2728287196801335122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1167965531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583982790 + 583982791.

It is an arithmetic number, because the mean of its divisors is an integer number (583982791).

Almost surely, 2^1167965581 is an apocalyptic number.

It is an amenable number.

1167965581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1167965581 is an equidigital number, since it uses as much as digits as its factorization.

1167965581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 49.

The square root of 1167965581 is about 34175.5114226547. The cubic root of 1167965581 is about 1053.1171408994.

It can be divided in two parts, 116 and 7965581, that added together give a palindrome (7965697).

The spelling of 1167965581 in words is "one billion, one hundred sixty-seven million, nine hundred sixty-five thousand, five hundred eighty-one".