85539381 has 4 divisors (see below), whose sum is σ = 114052512. Its totient is φ = 57026252.

The previous prime is 85539367. The next prime is 85539397. The reversal of 85539381 is 18393558.

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 85539381 - 2¹³ = 85531189 is a prime.

It is a super-2 number, since 2×85539381² = 14633971403726322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85539481) 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, 14256561 + ... + 14256566.

It is an arithmetic number, because the mean of its divisors is an integer number (28513128).

Almost surely, 2^85539381 is an apocalyptic number.

It is an amenable number.

85539381 is a deficient number, since it is larger than the sum of its proper divisors (28513131).

85539381 is a wasteful number, since it uses less digits than its factorization.

85539381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28513130.

The product of its digits is 129600, while the sum is 42.

The square root of 85539381 is about 9248.7502398973. The cubic root of 85539381 is about 440.6110329459.

The spelling of 85539381 in words is "eighty-five million, five hundred thirty-nine thousand, three hundred eighty-one".