85213409 has 4 divisors (see below), whose sum is σ = 86009904. Its totient is φ = 84416916.

The previous prime is 85213391. The next prime is 85213421. The reversal of 85213409 is 90431258.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90431258 = 2 ⋅45215629.

It is a cyclic number.

It is not a de Polignac number, because 85213409 - 2⁸ = 85213153 is a prime.

It is a super-2 number, since 2×85213409² = 14522650146802562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85213439) 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, 398087 + ... + 398300.

It is an arithmetic number, because the mean of its divisors is an integer number (21502476).

Almost surely, 2^85213409 is an apocalyptic number.

It is an amenable number.

85213409 is a deficient number, since it is larger than the sum of its proper divisors (796495).

85213409 is a wasteful number, since it uses less digits than its factorization.

85213409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796494.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 85213409 is about 9231.1109298935. The cubic root of 85213409 is about 440.0506295046.

The spelling of 85213409 in words is "eighty-five million, two hundred thirteen thousand, four hundred nine".