85745229931 has 4 divisors (see below), whose sum is σ = 87363064512. Its totient is φ = 84127395352.

The previous prime is 85745229851. The next prime is 85745229953. The reversal of 85745229931 is 13992254758.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85745229931 - 2¹³ = 85745221739 is a prime.

It is a super-2 number, since 2×85745229931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85745229961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808917211 + ... + 808917316.

It is an arithmetic number, because the mean of its divisors is an integer number (21840766128).

Almost surely, 2^85745229931 is an apocalyptic number.

85745229931 is a deficient number, since it is larger than the sum of its proper divisors (1617834581).

85745229931 is a wasteful number, since it uses less digits than its factorization.

85745229931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617834580.

The product of its digits is 5443200, while the sum is 55.

The spelling of 85745229931 in words is "eighty-five billion, seven hundred forty-five million, two hundred twenty-nine thousand, nine hundred thirty-one".