155716081 has 4 divisors (see below), whose sum is σ = 157849252. Its totient is φ = 153582912.

The previous prime is 155716079. The next prime is 155716087. The reversal of 155716081 is 180617551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180617551 = 23 ⋅7852937.

It can be written as a sum of positive squares in 2 ways, for example, as 118701025 + 37015056 = 10895^2 + 6084^2 .

It is a cyclic number.

It is not a de Polignac number, because 155716081 - 2¹ = 155716079 is a prime.

It is a super-2 number, since 2×155716081² = 48494995763997122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155716087) 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 in 3 ways as a sum of consecutive naturals, for example, 1066476 + ... + 1066621.

It is an arithmetic number, because the mean of its divisors is an integer number (39462313).

Almost surely, 2^155716081 is an apocalyptic number.

It is an amenable number.

155716081 is a deficient number, since it is larger than the sum of its proper divisors (2133171).

155716081 is an equidigital number, since it uses as much as digits as its factorization.

155716081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133170.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 155716081 is about 12478.6249643140. The cubic root of 155716081 is about 537.9944824685.

The spelling of 155716081 in words is "one hundred fifty-five million, seven hundred sixteen thousand, eighty-one".