1515123013 has 2 divisors, whose sum is σ = 1515123014. Its totient is φ = 1515123012.

The previous prime is 1515122981. The next prime is 1515123073. The reversal of 1515123013 is 3103215151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428688804 + 86434209 = 37798^2 + 9297^2 .

It is a cyclic number.

It is not a de Polignac number, because 1515123013 - 2⁵ = 1515122981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1515123073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 757561506 + 757561507.

It is an arithmetic number, because the mean of its divisors is an integer number (757561507).

Almost surely, 2^1515123013 is an apocalyptic number.

It is an amenable number.

1515123013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1515123013 is an equidigital number, since it uses as much as digits as its factorization.

1515123013 is an evil number, because the sum of its binary digits is even.

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

The square root of 1515123013 is about 38924.5810895891. The cubic root of 1515123013 is about 1148.5483922721.

Adding to 1515123013 its reverse (3103215151), we get a palindrome (4618338164).

The spelling of 1515123013 in words is "one billion, five hundred fifteen million, one hundred twenty-three thousand, thirteen".