125513123 has 4 divisors (see below), whose sum is σ = 125640768. Its totient is φ = 125385480.

The previous prime is 125513099. The next prime is 125513147. The reversal of 125513123 is 321315521.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (125513099) and next prime (125513147).

It is a cyclic number.

It is not a de Polignac number, because 125513123 - 2⁸ = 125512867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125513153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62336 + ... + 64317.

It is an arithmetic number, because the mean of its divisors is an integer number (31410192).

Almost surely, 2^125513123 is an apocalyptic number.

125513123 is a deficient number, since it is larger than the sum of its proper divisors (127645).

125513123 is an equidigital number, since it uses as much as digits as its factorization.

125513123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127644.

The product of its digits is 900, while the sum is 23.

The square root of 125513123 is about 11203.2639440477. The cubic root of 125513123 is about 500.6832299684.

Adding to 125513123 its reverse (321315521), we get a palindrome (446828644).

The spelling of 125513123 in words is "one hundred twenty-five million, five hundred thirteen thousand, one hundred twenty-three".