213540146 has 4 divisors (see below), whose sum is σ = 320310222. Its totient is φ = 106770072.

The previous prime is 213540143. The next prime is 213540149. The reversal of 213540146 is 641045312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (213540143) and next prime (213540149).

It can be written as a sum of positive squares in only one way, i.e., 121859521 + 91680625 = 11039^2 + 9575^2 .

It is not an unprimeable number, because it can be changed into a prime (213540143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53385035 + ... + 53385038.

Almost surely, 2^213540146 is an apocalyptic number.

213540146 is a deficient number, since it is larger than the sum of its proper divisors (106770076).

213540146 is a wasteful number, since it uses less digits than its factorization.

213540146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106770075.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 213540146 is about 14613.0128994674. The cubic root of 213540146 is about 597.7136561937.

Adding to 213540146 its reverse (641045312), we get a palindrome (854585458).

The spelling of 213540146 in words is "two hundred thirteen million, five hundred forty thousand, one hundred forty-six".