1227577661 has 2 divisors, whose sum is σ = 1227577662. Its totient is φ = 1227577660.

The previous prime is 1227577639. The next prime is 1227577693. The reversal of 1227577661 is 1667757221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142845636 + 84732025 = 33806^2 + 9205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1227577661 - 2¹⁸ = 1227315517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1227577961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613788830 + 613788831.

It is an arithmetic number, because the mean of its divisors is an integer number (613788831).

Almost surely, 2^1227577661 is an apocalyptic number.

It is an amenable number.

1227577661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227577661 is an equidigital number, since it uses as much as digits as its factorization.

1227577661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 44.

The square root of 1227577661 is about 35036.8043776826. The cubic root of 1227577661 is about 1070.7374486572.

The spelling of 1227577661 in words is "one billion, two hundred twenty-seven million, five hundred seventy-seven thousand, six hundred sixty-one".