1081997677 has 2 divisors, whose sum is σ = 1081997678. Its totient is φ = 1081997676.

The previous prime is 1081997659. The next prime is 1081997689. The reversal of 1081997677 is 7767991801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 748241316 + 333756361 = 27354^2 + 18269^2 .

It is an emirp because it is prime and its reverse (7767991801) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081997677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081997647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540998838 + 540998839.

It is an arithmetic number, because the mean of its divisors is an integer number (540998839).

Almost surely, 2^1081997677 is an apocalyptic number.

It is an amenable number.

1081997677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081997677 is an equidigital number, since it uses as much as digits as its factorization.

1081997677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 55.

The square root of 1081997677 is about 32893.7330961385. The cubic root of 1081997677 is about 1026.6177671913.

The spelling of 1081997677 in words is "one billion, eighty-one million, nine hundred ninety-seven thousand, six hundred seventy-seven".