1315540123 has 8 divisors (see below), whose sum is σ = 1332172800. Its totient is φ = 1298926248.

The previous prime is 1315540117. The next prime is 1315540133. The reversal of 1315540123 is 3210455131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1315540123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315540133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182298 + ... + 189376.

It is an arithmetic number, because the mean of its divisors is an integer number (166521600).

Almost surely, 2^1315540123 is an apocalyptic number.

1315540123 is a deficient number, since it is larger than the sum of its proper divisors (16632677).

1315540123 is an equidigital number, since it uses as much as digits as its factorization.

1315540123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1315540123 is about 36270.3752806612. The cubic root of 1315540123 is about 1095.7244840317.

Adding to 1315540123 its reverse (3210455131), we get a palindrome (4525995254).

The spelling of 1315540123 in words is "one billion, three hundred fifteen million, five hundred forty thousand, one hundred twenty-three".