85121001 has 12 divisors (see below), whose sum is σ = 140517312. Its totient is φ = 48640536.

The previous prime is 85120991. The next prime is 85121027. The reversal of 85121001 is 10012158.

It is not a de Polignac number, because 85121001 - 2⁷ = 85120873 is a prime.

It is a super-2 number, since 2×85121001² = 14491169622484002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85121041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 675501 + ... + 675626.

It is an arithmetic number, because the mean of its divisors is an integer number (11709776).

Almost surely, 2^85121001 is an apocalyptic number.

It is an amenable number.

85121001 is a deficient number, since it is larger than the sum of its proper divisors (55396311).

85121001 is a wasteful number, since it uses less digits than its factorization.

85121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351140 (or 1351137 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 85121001 is about 9226.1043241446. The cubic root of 85121001 is about 439.8915038964.

Adding to 85121001 its reverse (10012158), we get a palindrome (95133159).

The spelling of 85121001 in words is "eighty-five million, one hundred twenty-one thousand, one".