1327123661 has 2 divisors, whose sum is σ = 1327123662. Its totient is φ = 1327123660.

The previous prime is 1327123619. The next prime is 1327123673. The reversal of 1327123661 is 1663217231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823345636 + 503778025 = 28694^2 + 22445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1327123661 - 2⁶ = 1327123597 is a prime.

It is a super-2 number, since 2×1327123661² = 3522514423172085842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1327123601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663561830 + 663561831.

It is an arithmetic number, because the mean of its divisors is an integer number (663561831).

Almost surely, 2^1327123661 is an apocalyptic number.

It is an amenable number.

1327123661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1327123661 is an equidigital number, since it uses as much as digits as its factorization.

1327123661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 1327123661 is about 36429.7084945790. The cubic root of 1327123661 is about 1098.9310996730.

The spelling of 1327123661 in words is "one billion, three hundred twenty-seven million, one hundred twenty-three thousand, six hundred sixty-one".