161286577 has 4 divisors (see below), whose sum is σ = 161552896. Its totient is φ = 161020260.

The previous prime is 161286569. The next prime is 161286607. The reversal of 161286577 is 775682161.

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 161286577 - 2³ = 161286569 is a prime.

It is a super-3 number, since 3×161286577³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161286277) 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, 132249 + ... + 133462.

It is an arithmetic number, because the mean of its divisors is an integer number (40388224).

Almost surely, 2^161286577 is an apocalyptic number.

It is an amenable number.

161286577 is a deficient number, since it is larger than the sum of its proper divisors (266319).

161286577 is an equidigital number, since it uses as much as digits as its factorization.

161286577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266318.

The product of its digits is 141120, while the sum is 43.

The square root of 161286577 is about 12699.8652355055. The cubic root of 161286577 is about 544.3347684009.

The spelling of 161286577 in words is "one hundred sixty-one million, two hundred eighty-six thousand, five hundred seventy-seven".