1061656691 has 2 divisors, whose sum is σ = 1061656692. Its totient is φ = 1061656690.

The previous prime is 1061656669. The next prime is 1061656781. The reversal of 1061656691 is 1966561601.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1061656691 is a prime.

It is a super-2 number, since 2×1061656691² = 2254229859090138962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1061656291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530828345 + 530828346.

It is an arithmetic number, because the mean of its divisors is an integer number (530828346).

Almost surely, 2^1061656691 is an apocalyptic number.

1061656691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1061656691 is an equidigital number, since it uses as much as digits as its factorization.

1061656691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1061656691 is about 32583.0736886501. The cubic root of 1061656691 is about 1020.1437356714.

The spelling of 1061656691 in words is "one billion, sixty-one million, six hundred fifty-six thousand, six hundred ninety-one".