215220230609 has 4 divisors (see below), whose sum is σ = 215402467380. Its totient is φ = 215037993840.

The previous prime is 215220230591. The next prime is 215220230651. The reversal of 215220230609 is 906032022512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 80941957009 + 134278273600 = 284503^2 + 366440^2 .

It is a cyclic number.

It is not a de Polignac number, because 215220230609 - 2⁸ = 215220230353 is a prime.

It is a super-2 number, since 2×215220230609² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215220230699) 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, 91116614 + ... + 91118975.

It is an arithmetic number, because the mean of its divisors is an integer number (53850616845).

Almost surely, 2^215220230609 is an apocalyptic number.

It is an amenable number.

215220230609 is a deficient number, since it is larger than the sum of its proper divisors (182236771).

215220230609 is a wasteful number, since it uses less digits than its factorization.

215220230609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182236770.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 215220230609 in words is "two hundred fifteen billion, two hundred twenty million, two hundred thirty thousand, six hundred nine".