85202009 has 4 divisors (see below), whose sum is σ = 87504804. Its totient is φ = 82899216.

The previous prime is 85201997. The next prime is 85202021. The reversal of 85202009 is 90020258.

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

It is an interprime number because it is at equal distance from previous prime (85201997) and next prime (85202021).

It can be written as a sum of positive squares in 2 ways, for example, as 31326409 + 53875600 = 5597^2 + 7340^2 .

It is a cyclic number.

It is not a de Polignac number, because 85202009 - 2⁴ = 85201993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85202209) 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, 1151342 + ... + 1151415.

It is an arithmetic number, because the mean of its divisors is an integer number (21876201).

Almost surely, 2^85202009 is an apocalyptic number.

It is an amenable number.

85202009 is a deficient number, since it is larger than the sum of its proper divisors (2302795).

85202009 is a wasteful number, since it uses less digits than its factorization.

85202009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302794.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 85202009 is about 9230.4934320978. The cubic root of 85202009 is about 440.0310050466.

The spelling of 85202009 in words is "eighty-five million, two hundred two thousand, nine".