1197657161 has 2 divisors, whose sum is σ = 1197657162. Its totient is φ = 1197657160.

The previous prime is 1197657137. The next prime is 1197657169. The reversal of 1197657161 is 1617567911.

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., 903363136 + 294294025 = 30056^2 + 17155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1197657161 - 2¹⁴ = 1197640777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1197657169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 598828580 + 598828581.

It is an arithmetic number, because the mean of its divisors is an integer number (598828581).

Almost surely, 2^1197657161 is an apocalyptic number.

It is an amenable number.

1197657161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1197657161 is an equidigital number, since it uses as much as digits as its factorization.

1197657161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 44.

The square root of 1197657161 is about 34607.1836617775. The cubic root of 1197657161 is about 1061.9665525362.

The spelling of 1197657161 in words is "one billion, one hundred ninety-seven million, six hundred fifty-seven thousand, one hundred sixty-one".