85321551 has 8 divisors (see below), whose sum is σ = 130013824. Its totient is φ = 48755160.

The previous prime is 85321549. The next prime is 85321553. The reversal of 85321551 is 15512358.

It is an interprime number because it is at equal distance from previous prime (85321549) and next prime (85321553).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85321551 - 2¹ = 85321549 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 (85321553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2031445 + ... + 2031486.

It is an arithmetic number, because the mean of its divisors is an integer number (16251728).

Almost surely, 2^85321551 is an apocalyptic number.

85321551 is a deficient number, since it is larger than the sum of its proper divisors (44692273).

85321551 is a wasteful number, since it uses less digits than its factorization.

85321551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062941.

The product of its digits is 6000, while the sum is 30.

The square root of 85321551 is about 9236.9665475198. The cubic root of 85321551 is about 440.2367028744.

The spelling of 85321551 in words is "eighty-five million, three hundred twenty-one thousand, five hundred fifty-one".