1531040123 has 4 divisors (see below), whose sum is σ = 1583834640. Its totient is φ = 1478245608.

The previous prime is 1531040053. The next prime is 1531040141. The reversal of 1531040123 is 3210401351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210401351 = 911 ⋅3524041.

It is a cyclic number.

It is not a de Polignac number, because 1531040123 - 2¹⁸ = 1530777979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1531040095 and 1531040104.

It is not an unprimeable number, because it can be changed into a prime (1531040153) 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, 26397215 + ... + 26397272.

It is an arithmetic number, because the mean of its divisors is an integer number (395958660).

Almost surely, 2^1531040123 is an apocalyptic number.

1531040123 is a deficient number, since it is larger than the sum of its proper divisors (52794517).

1531040123 is an equidigital number, since it uses as much as digits as its factorization.

1531040123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52794516.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1531040123 is about 39128.5078044129. The cubic root of 1531040123 is about 1152.5564107697.

Adding to 1531040123 its reverse (3210401351), we get a palindrome (4741441474).

The spelling of 1531040123 in words is "one billion, five hundred thirty-one million, forty thousand, one hundred twenty-three".