3138621461 has 4 divisors (see below), whose sum is σ = 3138793452. Its totient is φ = 3138449472.

The previous prime is 3138621397. The next prime is 3138621491. The reversal of 3138621461 is 1641268313.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1156680100 + 1981941361 = 34010^2 + 44519^2 .

It is a cyclic number.

It is not a de Polignac number, because 3138621461 - 2⁶ = 3138621397 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 (3138621491) 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, 54866 + ... + 96371.

It is an arithmetic number, because the mean of its divisors is an integer number (784698363).

Almost surely, 2^3138621461 is an apocalyptic number.

It is an amenable number.

3138621461 is a deficient number, since it is larger than the sum of its proper divisors (171991).

3138621461 is a wasteful number, since it uses less digits than its factorization.

3138621461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171990.

The product of its digits is 20736, while the sum is 35.

The square root of 3138621461 is about 56023.4010124341. The cubic root of 3138621461 is about 1464.1300244647.

Adding to 3138621461 its reverse (1641268313), we get a palindrome (4779889774).

The spelling of 3138621461 in words is "three billion, one hundred thirty-eight million, six hundred twenty-one thousand, four hundred sixty-one".