2515400123 has 4 divisors (see below), whose sum is σ = 2520342480. Its totient is φ = 2510457768.

The previous prime is 2515400099. The next prime is 2515400131. The reversal of 2515400123 is 3210045152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2515400123 - 2⁶ = 2515400059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2515400423) 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, 2470415 + ... + 2471432.

It is an arithmetic number, because the mean of its divisors is an integer number (630085620).

Almost surely, 2^2515400123 is an apocalyptic number.

2515400123 is a deficient number, since it is larger than the sum of its proper divisors (4942357).

2515400123 is an equidigital number, since it uses as much as digits as its factorization.

2515400123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942356.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2515400123 is about 50153.7647938816. The cubic root of 2515400123 is about 1359.9899298202.

Adding to 2515400123 its reverse (3210045152), we get a palindrome (5725445275).

The spelling of 2515400123 in words is "two billion, five hundred fifteen million, four hundred thousand, one hundred twenty-three".