212545551 has 8 divisors (see below), whose sum is σ = 285032880. Its totient is φ = 140877632.

The previous prime is 212545513. The next prime is 212545561. The reversal of 212545551 is 155545212.

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 212545551 - 2²⁵ = 178991119 is a prime.

It is a super-2 number, since 2×212545551² = 90351222499787202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212545561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204246 + ... + 205283.

It is an arithmetic number, because the mean of its divisors is an integer number (35629110).

Almost surely, 2^212545551 is an apocalyptic number.

212545551 is a deficient number, since it is larger than the sum of its proper divisors (72487329).

212545551 is a wasteful number, since it uses less digits than its factorization.

212545551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409705.

The product of its digits is 10000, while the sum is 30.

The square root of 212545551 is about 14578.9420398052. The cubic root of 212545551 is about 596.7842316255.

The spelling of 212545551 in words is "two hundred twelve million, five hundred forty-five thousand, five hundred fifty-one".