1167661993 has 2 divisors, whose sum is σ = 1167661994. Its totient is φ = 1167661992.

The previous prime is 1167661981. The next prime is 1167662047. The reversal of 1167661993 is 3991667611.

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., 981694224 + 185967769 = 31332^2 + 13637^2 .

It is a cyclic number.

It is not a de Polignac number, because 1167661993 - 2⁵ = 1167661961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1167661393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583830996 + 583830997.

It is an arithmetic number, because the mean of its divisors is an integer number (583830997).

Almost surely, 2^1167661993 is an apocalyptic number.

It is an amenable number.

1167661993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1167661993 is an equidigital number, since it uses as much as digits as its factorization.

1167661993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 1167661993 is about 34171.0695325739. The cubic root of 1167661993 is about 1053.0258878018.

The spelling of 1167661993 in words is "one billion, one hundred sixty-seven million, six hundred sixty-one thousand, nine hundred ninety-three".