85521019 has 8 divisors (see below), whose sum is σ = 86301072. Its totient is φ = 84744960.

The previous prime is 85521013. The next prime is 85521041. The reversal of 85521019 is 91012558.

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

It is a cyclic number.

It is not a de Polignac number, because 85521019 - 2⁵ = 85520987 is a prime.

It is a super-2 number, since 2×85521019² = 14627689381596722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85521013) 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, 55392 + ... + 56914.

It is an arithmetic number, because the mean of its divisors is an integer number (10787634).

Almost surely, 2^85521019 is an apocalyptic number.

85521019 is a deficient number, since it is larger than the sum of its proper divisors (780053).

85521019 is a wasteful number, since it uses less digits than its factorization.

85521019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 85521019 is about 9247.7575119593. The cubic root of 85521019 is about 440.5795033017.

The spelling of 85521019 in words is "eighty-five million, five hundred twenty-one thousand, nineteen".