161457559 has 2 divisors, whose sum is σ = 161457560. Its totient is φ = 161457558.

The previous prime is 161457553. The next prime is 161457563. The reversal of 161457559 is 955754161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161457559 - 2⁹ = 161457047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161457553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80728779 + 80728780.

It is an arithmetic number, because the mean of its divisors is an integer number (80728780).

Almost surely, 2^161457559 is an apocalyptic number.

161457559 is a deficient number, since it is larger than the sum of its proper divisors (1).

161457559 is an equidigital number, since it uses as much as digits as its factorization.

161457559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 43.

The square root of 161457559 is about 12706.5950986092. The cubic root of 161457559 is about 544.5270525940.

The spelling of 161457559 in words is "one hundred sixty-one million, four hundred fifty-seven thousand, five hundred fifty-nine".