1211161667 has 2 divisors, whose sum is σ = 1211161668. Its totient is φ = 1211161666.

The previous prime is 1211161639. The next prime is 1211161673. The reversal of 1211161667 is 7661611121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211161667 - 2⁸ = 1211161411 is a prime.

It is a super-2 number, since 2×1211161667² = 2933825167220437778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211161687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605580833 + 605580834.

It is an arithmetic number, because the mean of its divisors is an integer number (605580834).

Almost surely, 2^1211161667 is an apocalyptic number.

1211161667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211161667 is an equidigital number, since it uses as much as digits as its factorization.

1211161667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 1211161667 is about 34801.7480451773. The cubic root of 1211161667 is about 1065.9431400784.

Adding to 1211161667 its reverse (7661611121), we get a palindrome (8872772788).

The spelling of 1211161667 in words is "one billion, two hundred eleven million, one hundred sixty-one thousand, six hundred sixty-seven".