215655097 has 4 divisors (see below), whose sum is σ = 246462976. Its totient is φ = 184847220.

The previous prime is 215655059. The next prime is 215655103. The reversal of 215655097 is 790556512.

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 215655097 - 2¹¹ = 215653049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215655697) 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, 15403929 + ... + 15403942.

It is an arithmetic number, because the mean of its divisors is an integer number (61615744).

Almost surely, 2^215655097 is an apocalyptic number.

It is an amenable number.

215655097 is a deficient number, since it is larger than the sum of its proper divisors (30807879).

215655097 is an equidigital number, since it uses as much as digits as its factorization.

215655097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30807878.

The product of its (nonzero) digits is 94500, while the sum is 40.

The square root of 215655097 is about 14685.1999305423. The cubic root of 215655097 is about 599.6804752405.

It can be divided in two parts, 21565 and 5097, that added together give a palindrome (26662).

The spelling of 215655097 in words is "two hundred fifteen million, six hundred fifty-five thousand, ninety-seven".