213515605 has 4 divisors (see below), whose sum is σ = 256218732. Its totient is φ = 170812480.

The previous prime is 213515557. The next prime is 213515629. The reversal of 213515605 is 506515312.

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 158785201 + 54730404 = 12601^2 + 7398^2 .

It is a de Polignac number, because none of the positive numbers 2^k-213515605 is a prime.

It is a super-3 number, since 3×213515605³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21351556 + ... + 21351565.

It is an arithmetic number, because the mean of its divisors is an integer number (64054683).

Almost surely, 2^213515605 is an apocalyptic number.

It is an amenable number.

213515605 is a deficient number, since it is larger than the sum of its proper divisors (42703127).

213515605 is an equidigital number, since it uses as much as digits as its factorization.

213515605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42703126.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 213515605 is about 14612.1731785522. The cubic root of 213515605 is about 597.6907579970.

The spelling of 213515605 in words is "two hundred thirteen million, five hundred fifteen thousand, six hundred five".