1516521343 has 4 divisors (see below), whose sum is σ = 1521305640. Its totient is φ = 1511737048.

The previous prime is 1516521337. The next prime is 1516521361. The reversal of 1516521343 is 3431256151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3431256151 = 19 ⋅180592429.

It is a cyclic number.

It is not a de Polignac number, because 1516521343 - 2⁵ = 1516521311 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 (1516521373) 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, 2391673 + ... + 2392306.

It is an arithmetic number, because the mean of its divisors is an integer number (380326410).

Almost surely, 2^1516521343 is an apocalyptic number.

1516521343 is a deficient number, since it is larger than the sum of its proper divisors (4784297).

1516521343 is an equidigital number, since it uses as much as digits as its factorization.

1516521343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784296.

The product of its digits is 10800, while the sum is 31.

The square root of 1516521343 is about 38942.5389901583. The cubic root of 1516521343 is about 1148.9016212025.

Adding to 1516521343 its reverse (3431256151), we get a palindrome (4947777494).

The spelling of 1516521343 in words is "one billion, five hundred sixteen million, five hundred twenty-one thousand, three hundred forty-three".