85136431 has 16 divisors (see below), whose sum is σ = 91555200. Its totient is φ = 79013088.

The previous prime is 85136423. The next prime is 85136453. The reversal of 85136431 is 13463158.

It is a cyclic number.

It is not a de Polignac number, because 85136431 - 2³ = 85136423 is a prime.

It is a super-2 number, since 2×85136431² = 14496423766835522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85136393 and 85136402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85136231) 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, 83040 + ... + 84058.

It is an arithmetic number, because the mean of its divisors is an integer number (5722200).

Almost surely, 2^85136431 is an apocalyptic number.

85136431 is a deficient number, since it is larger than the sum of its proper divisors (6418769).

85136431 is a wasteful number, since it uses less digits than its factorization.

85136431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158.

The product of its digits is 8640, while the sum is 31.

The square root of 85136431 is about 9226.9405005126. The cubic root of 85136431 is about 439.9180822015.

Adding to 85136431 its reverse (13463158), we get a palindrome (98599589).

The spelling of 85136431 in words is "eighty-five million, one hundred thirty-six thousand, four hundred thirty-one".