85379221 has 8 divisors (see below), whose sum is σ = 86256800. Its totient is φ = 84505680.

The previous prime is 85379207. The next prime is 85379233. The reversal of 85379221 is 12297358.

85379221 = T₇₅₄₃ + T₇₅₄₄ + T₇₅₄₅.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85379221 is a prime.

It is a super-2 number, since 2×85379221² = 14579222757133682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85379291) 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, 57790 + ... + 59248.

It is an arithmetic number, because the mean of its divisors is an integer number (10782100).

Almost surely, 2^85379221 is an apocalyptic number.

85379221 is the 7545-th centered triangular number.

It is an amenable number.

85379221 is a deficient number, since it is larger than the sum of its proper divisors (877579).

85379221 is a wasteful number, since it uses less digits than its factorization.

85379221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019.

The product of its digits is 30240, while the sum is 37.

The square root of 85379221 is about 9240.0877160339. The cubic root of 85379221 is about 440.3358678660.

The spelling of 85379221 in words is "eighty-five million, three hundred seventy-nine thousand, two hundred twenty-one".