1516503243 has 4 divisors (see below), whose sum is σ = 2022004328. Its totient is φ = 1011002160.

The previous prime is 1516503223. The next prime is 1516503253. The reversal of 1516503243 is 3423056151.

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

It is not a de Polignac number, because 1516503243 - 2¹² = 1516499147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1516503243.

It is not an unprimeable number, because it can be changed into a prime (1516503223) 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, 252750538 + ... + 252750543.

It is an arithmetic number, because the mean of its divisors is an integer number (505501082).

Almost surely, 2^1516503243 is an apocalyptic number.

1516503243 is a deficient number, since it is larger than the sum of its proper divisors (505501085).

1516503243 is an equidigital number, since it uses as much as digits as its factorization.

1516503243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505501084.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1516503243 is about 38942.3065957835. The cubic root of 1516503243 is about 1148.8970503905.

Adding to 1516503243 its reverse (3423056151), we get a palindrome (4939559394).

The spelling of 1516503243 in words is "one billion, five hundred sixteen million, five hundred three thousand, two hundred forty-three".