85151639 has 4 divisors (see below), whose sum is σ = 86963424. Its totient is φ = 83339856.

The previous prime is 85151621. The next prime is 85151641. The reversal of 85151639 is 93615158.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85151639 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 (85151839) 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, 905822 + ... + 905915.

It is an arithmetic number, because the mean of its divisors is an integer number (21740856).

Almost surely, 2^85151639 is an apocalyptic number.

85151639 is a deficient number, since it is larger than the sum of its proper divisors (1811785).

85151639 is a wasteful number, since it uses less digits than its factorization.

85151639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811784.

The product of its digits is 32400, while the sum is 38.

The square root of 85151639 is about 9227.7645722027. The cubic root of 85151639 is about 439.9442749676.

The spelling of 85151639 in words is "eighty-five million, one hundred fifty-one thousand, six hundred thirty-nine".