353123561 has 4 divisors (see below), whose sum is σ = 403569792. Its totient is φ = 302677332.

The previous prime is 353123543. The next prime is 353123587. The reversal of 353123561 is 165321353.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165321353 = 659 ⋅250867.

It is a cyclic number.

It is not a de Polignac number, because 353123561 - 2⁶ = 353123497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (353123501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25223105 + ... + 25223118.

It is an arithmetic number, because the mean of its divisors is an integer number (100892448).

Almost surely, 2^353123561 is an apocalyptic number.

It is an amenable number.

353123561 is a deficient number, since it is larger than the sum of its proper divisors (50446231).

353123561 is an equidigital number, since it uses as much as digits as its factorization.

353123561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50446230.

The product of its digits is 8100, while the sum is 29.

The square root of 353123561 is about 18791.5821845847. The cubic root of 353123561 is about 706.8201119210.

The spelling of 353123561 in words is "three hundred fifty-three million, one hundred twenty-three thousand, five hundred sixty-one".