249706221 has 8 divisors (see below), whose sum is σ = 336053664. Its totient is φ = 164914800.

The previous prime is 249706213. The next prime is 249706241. The reversal of 249706221 is 122607942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 249706221 - 2³ = 249706213 is a prime.

It is a super-2 number, since 2×249706221² = 124706393612201682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249706241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388630 + ... + 389271.

It is an arithmetic number, because the mean of its divisors is an integer number (42006708).

Almost surely, 2^249706221 is an apocalyptic number.

It is an amenable number.

249706221 is a deficient number, since it is larger than the sum of its proper divisors (86347443).

249706221 is a wasteful number, since it uses less digits than its factorization.

249706221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778011.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 249706221 is about 15802.0954623113. The cubic root of 249706221 is about 629.7136693301.

The spelling of 249706221 in words is "two hundred forty-nine million, seven hundred six thousand, two hundred twenty-one".