85409641 has 4 divisors (see below), whose sum is σ = 85852372. Its totient is φ = 84966912.

The previous prime is 85409633. The next prime is 85409707. The reversal of 85409641 is 14690458.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22127616 + 63282025 = 4704^2 + 7955^2 .

It is a cyclic number.

It is not a de Polignac number, because 85409641 - 2³ = 85409633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85409641.

It is not an unprimeable number, because it can be changed into a prime (85409041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221076 + ... + 221461.

It is an arithmetic number, because the mean of its divisors is an integer number (21463093).

Almost surely, 2^85409641 is an apocalyptic number.

It is an amenable number.

85409641 is a deficient number, since it is larger than the sum of its proper divisors (442731).

85409641 is a wasteful number, since it uses less digits than its factorization.

85409641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442730.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 85409641 is about 9241.7336577073. The cubic root of 85409641 is about 440.3881578198.

It can be divided in two parts, 8540 and 9641, that added together give a palindrome (18181).

The spelling of 85409641 in words is "eighty-five million, four hundred nine thousand, six hundred forty-one".