123540451 has 4 divisors (see below), whose sum is σ = 130042600. Its totient is φ = 117038304.

The previous prime is 123540449. The next prime is 123540457. The reversal of 123540451 is 154045321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154045321 = 691 ⋅222931.

It is a cyclic number.

It is not a de Polignac number, because 123540451 - 2¹ = 123540449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123540457) 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, 3251046 + ... + 3251083.

It is an arithmetic number, because the mean of its divisors is an integer number (32510650).

Almost surely, 2^123540451 is an apocalyptic number.

123540451 is a deficient number, since it is larger than the sum of its proper divisors (6502149).

123540451 is an equidigital number, since it uses as much as digits as its factorization.

123540451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6502148.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 123540451 is about 11114.8752129747. The cubic root of 123540451 is about 498.0463108065.

Adding to 123540451 its reverse (154045321), we get a palindrome (277585772).

The spelling of 123540451 in words is "one hundred twenty-three million, five hundred forty thousand, four hundred fifty-one".