1538874461 has 4 divisors (see below), whose sum is σ = 1541898300. Its totient is φ = 1535850624.

The previous prime is 1538874433. The next prime is 1538874479. The reversal of 1538874461 is 1644788351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1644788351 = 23 ⋅71512537.

It can be written as a sum of positive squares in 2 ways, for example, as 742562500 + 796311961 = 27250^2 + 28219^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538874461 - 2³⁰ = 465132637 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 (1538874401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511156 + ... + 1512173.

It is an arithmetic number, because the mean of its divisors is an integer number (385474575).

Almost surely, 2^1538874461 is an apocalyptic number.

It is an amenable number.

1538874461 is a deficient number, since it is larger than the sum of its proper divisors (3023839).

1538874461 is an equidigital number, since it uses as much as digits as its factorization.

1538874461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023838.

The product of its digits is 645120, while the sum is 47.

The square root of 1538874461 is about 39228.4904246901. The cubic root of 1538874461 is about 1154.5189456130.

The spelling of 1538874461 in words is "one billion, five hundred thirty-eight million, eight hundred seventy-four thousand, four hundred sixty-one".