85177509 has 4 divisors (see below), whose sum is σ = 113570016. Its totient is φ = 56785004.

The previous prime is 85177483. The next prime is 85177511. The reversal of 85177509 is 90577158.

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.

It is a cyclic number.

It is not a de Polignac number, because 85177509 - 2⁷ = 85177381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85177529) 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 in 3 ways as a sum of consecutive naturals, for example, 14196249 + ... + 14196254.

It is an arithmetic number, because the mean of its divisors is an integer number (28392504).

Almost surely, 2^85177509 is an apocalyptic number.

It is an amenable number.

85177509 is a deficient number, since it is larger than the sum of its proper divisors (28392507).

85177509 is a wasteful number, since it uses less digits than its factorization.

85177509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28392506.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 85177509 is about 9229.1662136945. The cubic root of 85177509 is about 439.9888237519.

The spelling of 85177509 in words is "eighty-five million, one hundred seventy-seven thousand, five hundred nine".