212642545 has 8 divisors (see below), whose sum is σ = 270181224. Its totient is φ = 160107264.

The previous prime is 212642537. The next prime is 212642561. The reversal of 212642545 is 545246212.

It can be written as a sum of positive squares in 4 ways, for example, as 116445681 + 96196864 = 10791^2 + 9808^2 .

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 212642545 - 2³ = 212642537 is a prime.

It is a Duffinian number.

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, 1250754 + ... + 1250923.

It is an arithmetic number, because the mean of its divisors is an integer number (33772653).

Almost surely, 2^212642545 is an apocalyptic number.

It is an amenable number.

212642545 is a deficient number, since it is larger than the sum of its proper divisors (57538679).

212642545 is a wasteful number, since it uses less digits than its factorization.

212642545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501699.

The product of its digits is 19200, while the sum is 31.

The square root of 212642545 is about 14582.2681706242. The cubic root of 212642545 is about 596.8749975604.

Adding to 212642545 its reverse (545246212), we get a palindrome (757888757).

The spelling of 212642545 in words is "two hundred twelve million, six hundred forty-two thousand, five hundred forty-five".