212745631 has 8 divisors (see below), whose sum is σ = 243375104. Its totient is φ = 182175480.

The previous prime is 212745587. The next prime is 212745707. The reversal of 212745631 is 136547212.

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 212745631 - 2⁷ = 212745503 is a prime.

It is a super-2 number, since 2×212745631² = 90521407019176322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212745593 and 212745602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212745431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6855 + ... + 21736.

It is an arithmetic number, because the mean of its divisors is an integer number (30421888).

Almost surely, 2^212745631 is an apocalyptic number.

212745631 is a deficient number, since it is larger than the sum of its proper divisors (30629473).

212745631 is a wasteful number, since it uses less digits than its factorization.

212745631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29661.

The product of its digits is 10080, while the sum is 31.

The square root of 212745631 is about 14585.8023776548. The cubic root of 212745631 is about 596.9714340720.

The spelling of 212745631 in words is "two hundred twelve million, seven hundred forty-five thousand, six hundred thirty-one".