161748997 has 2 divisors, whose sum is σ = 161748998. Its totient is φ = 161748996.

The previous prime is 161748971. The next prime is 161749001. The reversal of 161748997 is 799847161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97732996 + 64016001 = 9886^2 + 8001^2 .

It is a cyclic number.

It is not a de Polignac number, because 161748997 - 2⁷ = 161748869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161748907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80874498 + 80874499.

It is an arithmetic number, because the mean of its divisors is an integer number (80874499).

Almost surely, 2^161748997 is an apocalyptic number.

It is an amenable number.

161748997 is a deficient number, since it is larger than the sum of its proper divisors (1).

161748997 is an equidigital number, since it uses as much as digits as its factorization.

161748997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 52.

The square root of 161748997 is about 12718.0579099169. The cubic root of 161748997 is about 544.8544874267.

The spelling of 161748997 in words is "one hundred sixty-one million, seven hundred forty-eight thousand, nine hundred ninety-seven".