161345497 has 2 divisors, whose sum is σ = 161345498. Its totient is φ = 161345496.

The previous prime is 161345489. The next prime is 161345533. The reversal of 161345497 is 794543161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145829776 + 15515721 = 12076^2 + 3939^2 .

It is a cyclic number.

It is not a de Polignac number, because 161345497 - 2³ = 161345489 is a prime.

It is not a weakly prime, because it can be changed into another prime (161345797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80672748 + 80672749.

It is an arithmetic number, because the mean of its divisors is an integer number (80672749).

Almost surely, 2^161345497 is an apocalyptic number.

It is an amenable number.

161345497 is a deficient number, since it is larger than the sum of its proper divisors (1).

161345497 is an equidigital number, since it uses as much as digits as its factorization.

161345497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 161345497 is about 12702.1847333441. The cubic root of 161345497 is about 544.4010444264.

The spelling of 161345497 in words is "one hundred sixty-one million, three hundred forty-five thousand, four hundred ninety-seven".