85161481 has 2 divisors, whose sum is σ = 85161482. Its totient is φ = 85161480.

The previous prime is 85161463. The next prime is 85161497. The reversal of 85161481 is 18416158.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59151481 + 26010000 = 7691^2 + 5100^2 .

It is a cyclic number.

It is not a de Polignac number, because 85161481 - 2⁹ = 85160969 is a prime.

It is a super-2 number, since 2×85161481² = 14504955692226722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85161431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42580740 + 42580741.

It is an arithmetic number, because the mean of its divisors is an integer number (42580741).

Almost surely, 2^85161481 is an apocalyptic number.

It is an amenable number.

85161481 is a deficient number, since it is larger than the sum of its proper divisors (1).

85161481 is an equidigital number, since it uses as much as digits as its factorization.

85161481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 34.

The square root of 85161481 is about 9228.2978387133. The cubic root of 85161481 is about 439.9612242000.

The spelling of 85161481 in words is "eighty-five million, one hundred sixty-one thousand, four hundred eighty-one".