1071656689 has 2 divisors, whose sum is σ = 1071656690. Its totient is φ = 1071656688.

The previous prime is 1071656671. The next prime is 1071656699. The reversal of 1071656689 is 9866561701.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 569538225 + 502118464 = 23865^2 + 22408^2 .

It is an emirp because it is prime and its reverse (9866561701) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1071656689 - 2⁹ = 1071656177 is a prime.

It is a super-2 number, since 2×1071656689² = 2296896118156885442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1071656609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535828344 + 535828345.

It is an arithmetic number, because the mean of its divisors is an integer number (535828345).

Almost surely, 2^1071656689 is an apocalyptic number.

It is an amenable number.

1071656689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071656689 is an equidigital number, since it uses as much as digits as its factorization.

1071656689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 1071656689 is about 32736.1679034062. The cubic root of 1071656689 is about 1023.3367239033.

The spelling of 1071656689 in words is "one billion, seventy-one million, six hundred fifty-six thousand, six hundred eighty-nine".