161148997 has 4 divisors (see below), whose sum is σ = 161598240. Its totient is φ = 160699756.

The previous prime is 161148941. The next prime is 161149031. The reversal of 161148997 is 799841161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161148997 - 2¹¹ = 161146949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161148917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224083 + ... + 224800.

It is an arithmetic number, because the mean of its divisors is an integer number (40399560).

Almost surely, 2^161148997 is an apocalyptic number.

It is an amenable number.

161148997 is a deficient number, since it is larger than the sum of its proper divisors (449243).

161148997 is an equidigital number, since it uses as much as digits as its factorization.

161148997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449242.

The product of its digits is 108864, while the sum is 46.

The square root of 161148997 is about 12694.4474869921. The cubic root of 161148997 is about 544.1799489837.

The spelling of 161148997 in words is "one hundred sixty-one million, one hundred forty-eight thousand, nine hundred ninety-seven".