123540001 has 4 divisors (see below), whose sum is σ = 133043092. Its totient is φ = 114036912.

The previous prime is 123539947. The next prime is 123540007. The reversal of 123540001 is 100045321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100045321 = 107 ⋅935003.

It can be written as a sum of positive squares in 2 ways, for example, as 31091776 + 92448225 = 5576^2 + 9615^2 .

It is a cyclic number.

It is not a de Polignac number, because 123540001 - 2¹⁵ = 123507233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123540007) 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, 4751526 + ... + 4751551.

It is an arithmetic number, because the mean of its divisors is an integer number (33260773).

Almost surely, 2^123540001 is an apocalyptic number.

It is an amenable number.

123540001 is a deficient number, since it is larger than the sum of its proper divisors (9503091).

123540001 is an equidigital number, since it uses as much as digits as its factorization.

123540001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503090.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 123540001 is about 11114.8549698140. The cubic root of 123540001 is about 498.0457060892.

Adding to 123540001 its reverse (100045321), we get a palindrome (223585322).

The spelling of 123540001 in words is "one hundred twenty-three million, five hundred forty thousand, one".