1515340243 has 4 divisors (see below), whose sum is σ = 1518940048. Its totient is φ = 1511740440.

The previous prime is 1515340241. The next prime is 1515340261. The reversal of 1515340243 is 3420435151.

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 1515340243 - 2¹ = 1515340241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1515340241) 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, 1799271 + ... + 1800112.

It is an arithmetic number, because the mean of its divisors is an integer number (379735012).

Almost surely, 2^1515340243 is an apocalyptic number.

1515340243 is a deficient number, since it is larger than the sum of its proper divisors (3599805).

1515340243 is an equidigital number, since it uses as much as digits as its factorization.

1515340243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3599804.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1515340243 is about 38927.3713856972. The cubic root of 1515340243 is about 1148.6032804984.

Adding to 1515340243 its reverse (3420435151), we get a palindrome (4935775394).

The spelling of 1515340243 in words is "one billion, five hundred fifteen million, three hundred forty thousand, two hundred forty-three".