215641613 has 4 divisors (see below), whose sum is σ = 235245408. Its totient is φ = 196037820.

The previous prime is 215641609. The next prime is 215641619. The reversal of 215641613 is 316146512.

It is a happy number.

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 215641613 - 2² = 215641609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215641619) 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, 9801881 + ... + 9801902.

It is an arithmetic number, because the mean of its divisors is an integer number (58811352).

Almost surely, 2^215641613 is an apocalyptic number.

It is an amenable number.

215641613 is a deficient number, since it is larger than the sum of its proper divisors (19603795).

215641613 is a wasteful number, since it uses less digits than its factorization.

215641613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19603794.

The product of its digits is 4320, while the sum is 29.

The square root of 215641613 is about 14684.7408216829. The cubic root of 215641613 is about 599.6679764864.

The spelling of 215641613 in words is "two hundred fifteen million, six hundred forty-one thousand, six hundred thirteen".