1520542643 has 4 divisors (see below), whose sum is σ = 1521215640. Its totient is φ = 1519869648.

The previous prime is 1520542633. The next prime is 1520542649. The reversal of 1520542643 is 3462450251.

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 1520542643 - 2¹⁸ = 1520280499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1520542649) 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, 333098 + ... + 337631.

It is an arithmetic number, because the mean of its divisors is an integer number (380303910).

Almost surely, 2^1520542643 is an apocalyptic number.

1520542643 is a deficient number, since it is larger than the sum of its proper divisors (672997).

1520542643 is an equidigital number, since it uses as much as digits as its factorization.

1520542643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672996.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 1520542643 is about 38994.1360078666. The cubic root of 1520542643 is about 1149.9162240169.

Adding to 1520542643 its reverse (3462450251), we get a palindrome (4982992894).

The spelling of 1520542643 in words is "one billion, five hundred twenty million, five hundred forty-two thousand, six hundred forty-three".