215220845 has 8 divisors (see below), whose sum is σ = 295160064. Its totient is φ = 147579984.

The previous prime is 215220791. The next prime is 215220853. The reversal of 215220845 is 548022512.

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

It is a cyclic number.

It is not a de Polignac number, because 215220845 - 2⁸ = 215220589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3074549 + ... + 3074618.

It is an arithmetic number, because the mean of its divisors is an integer number (36895008).

Almost surely, 2^215220845 is an apocalyptic number.

It is an amenable number.

215220845 is a deficient number, since it is larger than the sum of its proper divisors (79939219).

215220845 is an equidigital number, since it uses as much as digits as its factorization.

215220845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6149179.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 215220845 is about 14670.4071177319. The cubic root of 215220845 is about 599.2776909836.

The spelling of 215220845 in words is "two hundred fifteen million, two hundred twenty thousand, eight hundred forty-five".