213145505 has 8 divisors (see below), whose sum is σ = 264594600. Its totient is φ = 164636416.

The previous prime is 213145481. The next prime is 213145523. The reversal of 213145505 is 505541312.

213145505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15124321 + 198021184 = 3889^2 + 14072^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213145505 - 2⁶ = 213145441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734840 + ... + 735129.

It is an arithmetic number, because the mean of its divisors is an integer number (33074325).

Almost surely, 2^213145505 is an apocalyptic number.

It is an amenable number.

213145505 is a deficient number, since it is larger than the sum of its proper divisors (51449095).

213145505 is a wasteful number, since it uses less digits than its factorization.

213145505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470003.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 213145505 is about 14599.5035874512. The cubic root of 213145505 is about 597.3452199703.

Adding to 213145505 its reverse (505541312), we get a palindrome (718686817).

The spelling of 213145505 in words is "two hundred thirteen million, one hundred forty-five thousand, five hundred five".