85671421 has 4 divisors (see below), whose sum is σ = 93459744. Its totient is φ = 77883100.

The previous prime is 85671371. The next prime is 85671431. The reversal of 85671421 is 12417658.

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.

It is a cyclic number.

It is not a de Polignac number, because 85671421 - 2⁷ = 85671293 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 (85671431) 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, 3894145 + ... + 3894166.

It is an arithmetic number, because the mean of its divisors is an integer number (23364936).

Almost surely, 2^85671421 is an apocalyptic number.

It is an amenable number.

85671421 is a deficient number, since it is larger than the sum of its proper divisors (7788323).

85671421 is a wasteful number, since it uses less digits than its factorization.

85671421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7788322.

The product of its digits is 13440, while the sum is 34.

The square root of 85671421 is about 9255.8857490788. The cubic root of 85671421 is about 440.8376278810.

The spelling of 85671421 in words is "eighty-five million, six hundred seventy-one thousand, four hundred twenty-one".