6131381 has 4 divisors (see below), whose sum is σ = 6297132. Its totient is φ = 5965632.

The previous prime is 6131369. The next prime is 6131387. The reversal of 6131381 is 1831316.

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 5924356 + 207025 = 2434^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 6131381 - 2²² = 1937077 is a prime.

It is a super-2 number, since 2×6131381² = 75187665934322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6131387) 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, 82820 + ... + 82893.

It is an arithmetic number, because the mean of its divisors is an integer number (1574283).

Almost surely, 2^6131381 is an apocalyptic number.

It is an amenable number.

6131381 is a deficient number, since it is larger than the sum of its proper divisors (165751).

6131381 is a wasteful number, since it uses less digits than its factorization.

6131381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165750.

The product of its digits is 432, while the sum is 23.

The square root of 6131381 is about 2476.1625552455. The cubic root of 6131381 is about 183.0288009454.

Adding to 6131381 its reverse (1831316), we get a palindrome (7962697).

The spelling of 6131381 in words is "six million, one hundred thirty-one thousand, three hundred eighty-one".