212740617 has 4 divisors (see below), whose sum is σ = 283654160. Its totient is φ = 141827076.

The previous prime is 212740609. The next prime is 212740667. The reversal of 212740617 is 716047212.

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 212740617 - 2³ = 212740609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212740667) 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, 35456767 + ... + 35456772.

It is an arithmetic number, because the mean of its divisors is an integer number (70913540).

Almost surely, 2^212740617 is an apocalyptic number.

It is an amenable number.

212740617 is a deficient number, since it is larger than the sum of its proper divisors (70913543).

212740617 is an equidigital number, since it uses as much as digits as its factorization.

212740617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70913542.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 212740617 is about 14585.6304971708. The cubic root of 212740617 is about 596.9667442174.

Adding to 212740617 its reverse (716047212), we get a palindrome (928787829).

The spelling of 212740617 in words is "two hundred twelve million, seven hundred forty thousand, six hundred seventeen".