85744551 has 4 divisors (see below), whose sum is σ = 114326072. Its totient is φ = 57163032.

The previous prime is 85744517. The next prime is 85744567. The reversal of 85744551 is 15544758.

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

It is not a de Polignac number, because 85744551 - 2⁶ = 85744487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85744751) 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, 14290756 + ... + 14290761.

It is an arithmetic number, because the mean of its divisors is an integer number (28581518).

Almost surely, 2^85744551 is an apocalyptic number.

85744551 is a deficient number, since it is larger than the sum of its proper divisors (28581521).

85744551 is a wasteful number, since it uses less digits than its factorization.

85744551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28581520.

The product of its digits is 112000, while the sum is 39.

The square root of 85744551 is about 9259.8353657071. The cubic root of 85744551 is about 440.9630267078.

The spelling of 85744551 in words is "eighty-five million, seven hundred forty-four thousand, five hundred fifty-one".