1315121023 has 4 divisors (see below), whose sum is σ = 1318158688. Its totient is φ = 1312083360.

The previous prime is 1315121009. The next prime is 1315121039. The reversal of 1315121023 is 3201215131.

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

It is a cyclic number.

It is not a de Polignac number, because 1315121023 - 2²¹ = 1313023871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315124023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518183 + ... + 1519048.

It is an arithmetic number, because the mean of its divisors is an integer number (329539672).

Almost surely, 2^1315121023 is an apocalyptic number.

1315121023 is a deficient number, since it is larger than the sum of its proper divisors (3037665).

1315121023 is an equidigital number, since it uses as much as digits as its factorization.

1315121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037664.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1315121023 is about 36264.5973781593. The cubic root of 1315121023 is about 1095.6081143629.

Adding to 1315121023 its reverse (3201215131), we get a palindrome (4516336154).

The spelling of 1315121023 in words is "one billion, three hundred fifteen million, one hundred twenty-one thousand, twenty-three".