213542501 has 4 divisors (see below), whose sum is σ = 224781600. Its totient is φ = 202303404.

The previous prime is 213542489. The next prime is 213542509. The reversal of 213542501 is 105245312.

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 a cyclic number.

It is not a de Polignac number, because 213542501 - 2¹⁰ = 213541477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213542509) 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, 5619521 + ... + 5619558.

It is an arithmetic number, because the mean of its divisors is an integer number (56195400).

Almost surely, 2^213542501 is an apocalyptic number.

It is an amenable number.

213542501 is a deficient number, since it is larger than the sum of its proper divisors (11239099).

213542501 is a wasteful number, since it uses less digits than its factorization.

213542501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11239098.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 213542501 is about 14613.0934781106. The cubic root of 213542501 is about 597.7158534549.

Adding to 213542501 its reverse (105245312), we get a palindrome (318787813).

The spelling of 213542501 in words is "two hundred thirteen million, five hundred forty-two thousand, five hundred one".