217258542 has 12 divisors (see below), whose sum is σ = 470726880. Its totient is φ = 72419508.

The previous prime is 217258537. The next prime is 217258603. The reversal of 217258542 is 245852712.

It is a happy number.

217258542 is a `hidden beast` number, since 2 + 1 + 72 + 585 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 217258497 and 217258506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6034942 + ... + 6034977.

It is an arithmetic number, because the mean of its divisors is an integer number (39227240).

Almost surely, 2^217258542 is an apocalyptic number.

217258542 is an abundant number, since it is smaller than the sum of its proper divisors (253468338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217258542 is a wasteful number, since it uses less digits than its factorization.

217258542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12069927 (or 12069924 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 217258542 is about 14739.6927376387. The cubic root of 217258542 is about 601.1630606930.

The spelling of 217258542 in words is "two hundred seventeen million, two hundred fifty-eight thousand, five hundred forty-two".