85415791 has 4 divisors (see below), whose sum is σ = 85610800. Its totient is φ = 85220784.

The previous prime is 85415789. The next prime is 85415797. The reversal of 85415791 is 19751458.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19751458 = 2 ⋅9875729.

It is a cyclic number.

It is not a de Polignac number, because 85415791 - 2¹ = 85415789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85415797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96846 + ... + 97723.

It is an arithmetic number, because the mean of its divisors is an integer number (21402700).

Almost surely, 2^85415791 is an apocalyptic number.

85415791 is a deficient number, since it is larger than the sum of its proper divisors (195009).

85415791 is a wasteful number, since it uses less digits than its factorization.

85415791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195008.

The product of its digits is 50400, while the sum is 40.

The square root of 85415791 is about 9242.0663814972. The cubic root of 85415791 is about 440.3987277513.

The spelling of 85415791 in words is "eighty-five million, four hundred fifteen thousand, seven hundred ninety-one".