85144481 has 4 divisors (see below), whose sum is σ = 85342464. Its totient is φ = 84946500.

The previous prime is 85144469. The next prime is 85144487. The reversal of 85144481 is 18444158.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18444158 = 2 ⋅9222079.

It is a cyclic number.

It is not a de Polignac number, because 85144481 - 2¹⁴ = 85128097 is a prime.

It is a super-2 number, since 2×85144481² = 14499165289518722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85144487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98345 + ... + 99206.

It is an arithmetic number, because the mean of its divisors is an integer number (21335616).

Almost surely, 2^85144481 is an apocalyptic number.

It is an amenable number.

85144481 is a deficient number, since it is larger than the sum of its proper divisors (197983).

85144481 is a wasteful number, since it uses less digits than its factorization.

85144481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197982.

The product of its digits is 20480, while the sum is 35.

The square root of 85144481 is about 9227.3767128041. The cubic root of 85144481 is about 439.9319471197.

The spelling of 85144481 in words is "eighty-five million, one hundred forty-four thousand, four hundred eighty-one".