245301721 has 16 divisors (see below), whose sum is σ = 297561600. Its totient is φ = 197406720.

The previous prime is 245301703. The next prime is 245301731. The reversal of 245301721 is 127103542.

It is a happy number.

It is not a de Polignac number, because 245301721 - 2⁵ = 245301689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245301731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51136 + ... + 55726.

It is an arithmetic number, because the mean of its divisors is an integer number (18597600).

Almost surely, 2^245301721 is an apocalyptic number.

It is an amenable number.

245301721 is a deficient number, since it is larger than the sum of its proper divisors (52259879).

245301721 is a wasteful number, since it uses less digits than its factorization.

245301721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 245301721 is about 15662.1110007559. Note that the first 3 decimals coincide. The cubic root of 245301721 is about 625.9892353554.

The spelling of 245301721 in words is "two hundred forty-five million, three hundred one thousand, seven hundred twenty-one".