212979551 has 4 divisors (see below), whose sum is σ = 214050000. Its totient is φ = 211909104.

The previous prime is 212979523. The next prime is 212979583. The reversal of 212979551 is 155979212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212979551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212979499 and 212979508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212979751) 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, 534926 + ... + 535323.

It is an arithmetic number, because the mean of its divisors is an integer number (53512500).

Almost surely, 2^212979551 is an apocalyptic number.

212979551 is a deficient number, since it is larger than the sum of its proper divisors (1070449).

212979551 is a wasteful number, since it uses less digits than its factorization.

212979551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070448.

The product of its digits is 56700, while the sum is 41.

The square root of 212979551 is about 14593.8189313147. The cubic root of 212979551 is about 597.1901497400.

The spelling of 212979551 in words is "two hundred twelve million, nine hundred seventy-nine thousand, five hundred fifty-one".