123353561 has 4 divisors (see below), whose sum is σ = 124170624. Its totient is φ = 122536500.

The previous prime is 123353551. The next prime is 123353563. The reversal of 123353561 is 165353321.

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: 165353321 = 7 ⋅23621903.

It is not a de Polignac number, because 123353561 - 2¹⁴ = 123337177 is a prime.

It is a super-2 number, since 2×123353561² = 30432202022761442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123353563) 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, 408305 + ... + 408606.

It is an arithmetic number, because the mean of its divisors is an integer number (31042656).

Almost surely, 2^123353561 is an apocalyptic number.

It is an amenable number.

123353561 is a deficient number, since it is larger than the sum of its proper divisors (817063).

123353561 is an equidigital number, since it uses as much as digits as its factorization.

123353561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817062.

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

The square root of 123353561 is about 11106.4648290984. The cubic root of 123353561 is about 497.7950385839.

The spelling of 123353561 in words is "one hundred twenty-three million, three hundred fifty-three thousand, five hundred sixty-one".