353225721 has 4 divisors (see below), whose sum is σ = 470967632. Its totient is φ = 235483812.

The previous prime is 353225699. The next prime is 353225737. The reversal of 353225721 is 127522353.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 353225721 - 2¹⁸ = 352963577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (353225221) 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 3 ways as a sum of consecutive naturals, for example, 58870951 + ... + 58870956.

It is an arithmetic number, because the mean of its divisors is an integer number (117741908).

Almost surely, 2^353225721 is an apocalyptic number.

It is an amenable number.

353225721 is a deficient number, since it is larger than the sum of its proper divisors (117741911).

353225721 is a wasteful number, since it uses less digits than its factorization.

353225721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117741910.

The product of its digits is 12600, while the sum is 30.

The square root of 353225721 is about 18794.3002263984. The cubic root of 353225721 is about 706.8882672717. Note that the first 3 decimals are identical.

The spelling of 353225721 in words is "three hundred fifty-three million, two hundred twenty-five thousand, seven hundred twenty-one".