661097 has 2 divisors, whose sum is σ = 661098. Its totient is φ = 661096.

The previous prime is 661093. The next prime is 661099. The reversal of 661097 is 790166.

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., 534361 + 126736 = 731^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 661097 - 2² = 661093 is a prime.

Together with 661099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (661091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330548 + 330549.

It is an arithmetic number, because the mean of its divisors is an integer number (330549).

2⁶⁶¹⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

661097 is a deficient number, since it is larger than the sum of its proper divisors (1).

661097 is an equidigital number, since it uses as much as digits as its factorization.

661097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 661097 is about 813.0787169764. The cubic root of 661097 is about 87.1140882242.

The spelling of 661097 in words is "six hundred sixty-one thousand, ninety-seven".