215106897 has 4 divisors (see below), whose sum is σ = 286809200. Its totient is φ = 143404596.

The previous prime is 215106889. The next prime is 215106901. The reversal of 215106897 is 798601512.

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 not a de Polignac number, because 215106897 - 2³ = 215106889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215106817) 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, 35851147 + ... + 35851152.

It is an arithmetic number, because the mean of its divisors is an integer number (71702300).

Almost surely, 2^215106897 is an apocalyptic number.

It is an amenable number.

215106897 is a deficient number, since it is larger than the sum of its proper divisors (71702303).

215106897 is an equidigital number, since it uses as much as digits as its factorization.

215106897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71702302.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 215106897 is about 14666.5230030843. The cubic root of 215106897 is about 599.1719104163.

The spelling of 215106897 in words is "two hundred fifteen million, one hundred six thousand, eight hundred ninety-seven".