212545451 has 4 divisors (see below), whose sum is σ = 212914392. Its totient is φ = 212176512.

The previous prime is 212545391. The next prime is 212545469. The reversal of 212545451 is 154545212.

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

It is a cyclic number.

It is not a de Polignac number, because 212545451 - 2¹⁰ = 212544427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212545351) 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, 183605 + ... + 184758.

It is an arithmetic number, because the mean of its divisors is an integer number (53228598).

Almost surely, 2^212545451 is an apocalyptic number.

212545451 is a deficient number, since it is larger than the sum of its proper divisors (368941).

212545451 is an equidigital number, since it uses as much as digits as its factorization.

212545451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368940.

The product of its digits is 8000, while the sum is 29.

The square root of 212545451 is about 14578.9386102007. The cubic root of 212545451 is about 596.7841380324.

The spelling of 212545451 in words is "two hundred twelve million, five hundred forty-five thousand, four hundred fifty-one".