161547877 has 2 divisors, whose sum is σ = 161547878. Its totient is φ = 161547876.

The previous prime is 161547871. The next prime is 161547907. The reversal of 161547877 is 778745161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145298916 + 16248961 = 12054^2 + 4031^2 .

It is an emirp because it is prime and its reverse (778745161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161547877 - 2¹¹ = 161545829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161547871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80773938 + 80773939.

It is an arithmetic number, because the mean of its divisors is an integer number (80773939).

Almost surely, 2^161547877 is an apocalyptic number.

It is an amenable number.

161547877 is a deficient number, since it is larger than the sum of its proper divisors (1).

161547877 is an equidigital number, since it uses as much as digits as its factorization.

161547877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 329280, while the sum is 46.

The square root of 161547877 is about 12710.1485829238. The cubic root of 161547877 is about 544.6285682846.

The spelling of 161547877 in words is "one hundred sixty-one million, five hundred forty-seven thousand, eight hundred seventy-seven".