1127645681 has 2 divisors, whose sum is σ = 1127645682. Its totient is φ = 1127645680.

The previous prime is 1127645663. The next prime is 1127645713. The reversal of 1127645681 is 1865467211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 948085681 + 179560000 = 30791^2 + 13400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1127645681 is a prime.

It is a super-2 number, since 2×1127645681² = 2543169563755907522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1127645621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 563822840 + 563822841.

It is an arithmetic number, because the mean of its divisors is an integer number (563822841).

Almost surely, 2^1127645681 is an apocalyptic number.

It is an amenable number.

1127645681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1127645681 is an equidigital number, since it uses as much as digits as its factorization.

1127645681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The square root of 1127645681 is about 33580.4359858534. The cubic root of 1127645681 is about 1040.8565678012.

The spelling of 1127645681 in words is "one billion, one hundred twenty-seven million, six hundred forty-five thousand, six hundred eighty-one".