353488721 has 2 divisors, whose sum is σ = 353488722. Its totient is φ = 353488720.

The previous prime is 353488669. The next prime is 353488813. The reversal of 353488721 is 127884353.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331968400 + 21520321 = 18220^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 353488721 - 2⁶ = 353488657 is a prime.

It is equal to p_18980663 and since 353488721 and 18980663 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (353485721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176744360 + 176744361.

It is an arithmetic number, because the mean of its divisors is an integer number (176744361).

Almost surely, 2^353488721 is an apocalyptic number.

It is an amenable number.

353488721 is a deficient number, since it is larger than the sum of its proper divisors (1).

353488721 is an equidigital number, since it uses as much as digits as its factorization.

353488721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 353488721 is about 18801.2957266248. The cubic root of 353488721 is about 707.0636654954.

The spelling of 353488721 in words is "three hundred fifty-three million, four hundred eighty-eight thousand, seven hundred twenty-one".