161544511 has 2 divisors, whose sum is σ = 161544512. Its totient is φ = 161544510.

The previous prime is 161544497. The next prime is 161544521. The reversal of 161544511 is 115445161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161544511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161544511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161544521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80772255 + 80772256.

It is an arithmetic number, because the mean of its divisors is an integer number (80772256).

Almost surely, 2^161544511 is an apocalyptic number.

161544511 is a deficient number, since it is larger than the sum of its proper divisors (1).

161544511 is an equidigital number, since it uses as much as digits as its factorization.

161544511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 28.

The square root of 161544511 is about 12710.0161683611. The cubic root of 161544511 is about 544.6247856443.

Adding to 161544511 its reverse (115445161), we get a palindrome (276989672).

The spelling of 161544511 in words is "one hundred sixty-one million, five hundred forty-four thousand, five hundred eleven".