85556749 has 4 divisors (see below), whose sum is σ = 85633660. Its totient is φ = 85479840.

The previous prime is 85556747. The next prime is 85556771. The reversal of 85556749 is 94765558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94765558 = 2 ⋅47382779.

It can be written as a sum of positive squares in 2 ways, for example, as 11682724 + 73874025 = 3418^2 + 8595^2 .

It is a cyclic number.

It is not a de Polignac number, because 85556749 - 2¹ = 85556747 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 (85556741) 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, 36762 + ... + 39019.

It is an arithmetic number, because the mean of its divisors is an integer number (21408415).

Almost surely, 2^85556749 is an apocalyptic number.

It is an amenable number.

85556749 is a deficient number, since it is larger than the sum of its proper divisors (76911).

85556749 is a wasteful number, since it uses less digits than its factorization.

85556749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76910.

The product of its digits is 1512000, while the sum is 49.

The square root of 85556749 is about 9249.6891299113. The cubic root of 85556749 is about 440.6408516270.

The spelling of 85556749 in words is "eighty-five million, five hundred fifty-six thousand, seven hundred forty-nine".