162557081 has 2 divisors, whose sum is σ = 162557082. Its totient is φ = 162557080.

The previous prime is 162557069. The next prime is 162557099. The reversal of 162557081 is 180755261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158886025 + 3671056 = 12605^2 + 1916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162557081 is a prime.

It is a super-2 number, since 2×162557081² = 52849609166481122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_9109691 and since 162557081 and 9109691 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (162557011) 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 as a sum of consecutive naturals, namely, 81278540 + 81278541.

It is an arithmetic number, because the mean of its divisors is an integer number (81278541).

Almost surely, 2^162557081 is an apocalyptic number.

It is an amenable number.

162557081 is a deficient number, since it is larger than the sum of its proper divisors (1).

162557081 is an equidigital number, since it uses as much as digits as its factorization.

162557081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 162557081 is about 12749.7874884251. The cubic root of 162557081 is about 545.7603292271.

The spelling of 162557081 in words is "one hundred sixty-two million, five hundred fifty-seven thousand, eighty-one".