85553439 has 16 divisors (see below), whose sum is σ = 116159232. Its totient is φ = 55997568.

The previous prime is 85553437. The next prime is 85553441. The reversal of 85553439 is 93435558.

It is an interprime number because it is at equal distance from previous prime (85553437) and next prime (85553441).

It is not a de Polignac number, because 85553439 - 2¹ = 85553437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85553439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85553431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86542 + ... + 87524.

It is an arithmetic number, because the mean of its divisors is an integer number (7259952).

Almost surely, 2^85553439 is an apocalyptic number.

85553439 is a deficient number, since it is larger than the sum of its proper divisors (30605793).

85553439 is a wasteful number, since it uses less digits than its factorization.

85553439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486.

The product of its digits is 324000, while the sum is 42.

The square root of 85553439 is about 9249.5102032486. The cubic root of 85553439 is about 440.6351690827.

The spelling of 85553439 in words is "eighty-five million, five hundred fifty-three thousand, four hundred thirty-nine".