9157661 has 2 divisors, whose sum is σ = 9157662. Its totient is φ = 9157660.

The previous prime is 9157619. The next prime is 9157663. The reversal of 9157661 is 1667519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5428900 + 3728761 = 2330^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 9157661 - 2¹⁸ = 8895517 is a prime.

Together with 9157663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9157663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4578830 + 4578831.

It is an arithmetic number, because the mean of its divisors is an integer number (4578831).

Almost surely, 2^9157661 is an apocalyptic number.

It is an amenable number.

9157661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9157661 is an equidigital number, since it uses as much as digits as its factorization.

9157661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 35.

The square root of 9157661 is about 3026.1627517369. The cubic root of 9157661 is about 209.2159805703.

The spelling of 9157661 in words is "nine million, one hundred fifty-seven thousand, six hundred sixty-one".