1128264661 has 2 divisors, whose sum is σ = 1128264662. Its totient is φ = 1128264660.

The previous prime is 1128264629. The next prime is 1128264667. The reversal of 1128264661 is 1664628211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1068897636 + 59367025 = 32694^2 + 7705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128264661 - 2⁵ = 1128264629 is a prime.

It is a super-2 number, since 2×1128264661² = 2545962290522889842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1128264661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128264667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564132330 + 564132331.

It is an arithmetic number, because the mean of its divisors is an integer number (564132331).

Almost surely, 2^1128264661 is an apocalyptic number.

It is an amenable number.

1128264661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128264661 is an equidigital number, since it uses as much as digits as its factorization.

1128264661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 1128264661 is about 33589.6510997063. The cubic root of 1128264661 is about 1041.0469797253.

The spelling of 1128264661 in words is "one billion, one hundred twenty-eight million, two hundred sixty-four thousand, six hundred sixty-one".