161535497 has 2 divisors, whose sum is σ = 161535498. Its totient is φ = 161535496.

The previous prime is 161535443. The next prime is 161535499. The reversal of 161535497 is 794535161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122235136 + 39300361 = 11056^2 + 6269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161535497 is a prime.

Together with 161535499, 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 (161535499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80767748 + 80767749.

It is an arithmetic number, because the mean of its divisors is an integer number (80767749).

Almost surely, 2^161535497 is an apocalyptic number.

It is an amenable number.

161535497 is a deficient number, since it is larger than the sum of its proper divisors (1).

161535497 is an equidigital number, since it uses as much as digits as its factorization.

161535497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 41.

The square root of 161535497 is about 12709.6615611904. The cubic root of 161535497 is about 544.6146556414.

The spelling of 161535497 in words is "one hundred sixty-one million, five hundred thirty-five thousand, four hundred ninety-seven".