1315511023 has 4 divisors (see below), whose sum is σ = 1337807880. Its totient is φ = 1293214168.

The previous prime is 1315511003. The next prime is 1315511033. The reversal of 1315511023 is 3201155131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1315511023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1315510985 and 1315511003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315511003) 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, 11148340 + ... + 11148457.

It is an arithmetic number, because the mean of its divisors is an integer number (334451970).

Almost surely, 2^1315511023 is an apocalyptic number.

1315511023 is a deficient number, since it is larger than the sum of its proper divisors (22296857).

1315511023 is an equidigital number, since it uses as much as digits as its factorization.

1315511023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22296856.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1315511023 is about 36269.9741246117. The cubic root of 1315511023 is about 1095.7164047602.

Adding to 1315511023 its reverse (3201155131), we get a palindrome (4516666154).

The spelling of 1315511023 in words is "one billion, three hundred fifteen million, five hundred eleven thousand, twenty-three".