1531607123 has 2 divisors, whose sum is σ = 1531607124. Its totient is φ = 1531607122.

The previous prime is 1531607117. The next prime is 1531607149. The reversal of 1531607123 is 3217061351.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1531607123 - 2¹² = 1531603027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531607113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765803561 + 765803562.

It is an arithmetic number, because the mean of its divisors is an integer number (765803562).

Almost surely, 2^1531607123 is an apocalyptic number.

1531607123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531607123 is an equidigital number, since it uses as much as digits as its factorization.

1531607123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 1531607123 is about 39135.7524905297. The cubic root of 1531607123 is about 1152.6986711020.

Adding to 1531607123 its reverse (3217061351), we get a palindrome (4748668474).

The spelling of 1531607123 in words is "one billion, five hundred thirty-one million, six hundred seven thousand, one hundred twenty-three".