245543721 has 8 divisors (see below), whose sum is σ = 327645120. Its totient is φ = 163569072.

The previous prime is 245543719. The next prime is 245543737. The reversal of 245543721 is 127345542.

245543721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 245543721 - 2¹ = 245543719 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (245543741) 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, 27070 + ... + 34983.

It is an arithmetic number, because the mean of its divisors is an integer number (40955640).

Almost surely, 2^245543721 is an apocalyptic number.

It is an amenable number.

245543721 is a deficient number, since it is larger than the sum of its proper divisors (82101399).

245543721 is a wasteful number, since it uses less digits than its factorization.

245543721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63375.

The product of its digits is 33600, while the sum is 33.

The square root of 245543721 is about 15669.8347470546. The cubic root of 245543721 is about 626.1950222055.

The spelling of 245543721 in words is "two hundred forty-five million, five hundred forty-three thousand, seven hundred twenty-one".