1538303813 has 4 divisors (see below), whose sum is σ = 1538527488. Its totient is φ = 1538080140.

The previous prime is 1538303807. The next prime is 1538303827. The reversal of 1538303813 is 3183038351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1538303813 - 2¹⁶ = 1538238277 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 (1538308813) 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, 101183 + ... + 115388.

It is an arithmetic number, because the mean of its divisors is an integer number (384631872).

Almost surely, 2^1538303813 is an apocalyptic number.

It is an amenable number.

1538303813 is a deficient number, since it is larger than the sum of its proper divisors (223675).

1538303813 is an equidigital number, since it uses as much as digits as its factorization.

1538303813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223674.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1538303813 is about 39221.2163630859. The cubic root of 1538303813 is about 1154.3762210880.

The spelling of 1538303813 in words is "one billion, five hundred thirty-eight million, three hundred three thousand, eight hundred thirteen".