213113501 has 4 divisors (see below), whose sum is σ = 214669212. Its totient is φ = 211557792.

The previous prime is 213113497. The next prime is 213113503. The reversal of 213113501 is 105311312.

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 68873401 + 144240100 = 8299^2 + 12010^2 .

It is a cyclic number.

It is not a de Polignac number, because 213113501 - 2² = 213113497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213113501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777650 + ... + 777923.

It is an arithmetic number, because the mean of its divisors is an integer number (53667303).

Almost surely, 2^213113501 is an apocalyptic number.

It is an amenable number.

213113501 is a deficient number, since it is larger than the sum of its proper divisors (1555711).

213113501 is a wasteful number, since it uses less digits than its factorization.

213113501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555710.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 213113501 is about 14598.4074816399. The cubic root of 213113501 is about 597.3153211564.

Adding to 213113501 its reverse (105311312), we get a palindrome (318424813).

The spelling of 213113501 in words is "two hundred thirteen million, one hundred thirteen thousand, five hundred one".