123555001 has 4 divisors (see below), whose sum is σ = 124047504. Its totient is φ = 123062500.

The previous prime is 123554999. The next prime is 123555023. The reversal of 123555001 is 100555321.

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 a cyclic number.

It is not a de Polignac number, because 123555001 - 2¹ = 123554999 is a prime.

It is a super-2 number, since 2×123555001² = 30531676544220002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123555041) 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, 245875 + ... + 246376.

It is an arithmetic number, because the mean of its divisors is an integer number (31011876).

Almost surely, 2^123555001 is an apocalyptic number.

It is an amenable number.

123555001 is a deficient number, since it is larger than the sum of its proper divisors (492503).

123555001 is an equidigital number, since it uses as much as digits as its factorization.

123555001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492502.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 123555001 is about 11115.5297219701. The cubic root of 123555001 is about 498.0658625384.

The spelling of 123555001 in words is "one hundred twenty-three million, five hundred fifty-five thousand, one".