213972547 has 4 divisors (see below), whose sum is σ = 225234280. Its totient is φ = 202710816.

The previous prime is 213972541. The next prime is 213972599. The reversal of 213972547 is 745279312.

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 213972547 - 2⁷ = 213972419 is a prime.

It is a super-3 number, since 3×213972547³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213972541) 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 3 ways as a sum of consecutive naturals, for example, 5630838 + ... + 5630875.

It is an arithmetic number, because the mean of its divisors is an integer number (56308570).

Almost surely, 2^213972547 is an apocalyptic number.

213972547 is a deficient number, since it is larger than the sum of its proper divisors (11261733).

213972547 is a wasteful number, since it uses less digits than its factorization.

213972547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11261732.

The product of its digits is 105840, while the sum is 40.

The square root of 213972547 is about 14627.8004840099. The cubic root of 213972547 is about 598.1168243029.

The spelling of 213972547 in words is "two hundred thirteen million, nine hundred seventy-two thousand, five hundred forty-seven".