1167966721 has 2 divisors, whose sum is σ = 1167966722. Its totient is φ = 1167966720.

The previous prime is 1167966707. The next prime is 1167966733. The reversal of 1167966721 is 1276697611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827195121 + 340771600 = 28761^2 + 18460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1167966721 - 2⁹ = 1167966209 is a prime.

It is a super-2 number, since 2×1167966721² = 2728292522726983682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1167966791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583983360 + 583983361.

It is an arithmetic number, because the mean of its divisors is an integer number (583983361).

Almost surely, 2^1167966721 is an apocalyptic number.

It is an amenable number.

1167966721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1167966721 is an equidigital number, since it uses as much as digits as its factorization.

1167966721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 1167966721 is about 34175.5281012598. The cubic root of 1167966721 is about 1053.1174835331.

It can be divided in two parts, 11679 and 66721, that added together give a square (78400 = 280²).

The spelling of 1167966721 in words is "one billion, one hundred sixty-seven million, nine hundred sixty-six thousand, seven hundred twenty-one".