3161381 has 4 divisors (see below), whose sum is σ = 3171264. Its totient is φ = 3151500.

The previous prime is 3161351. The next prime is 3161407. The reversal of 3161381 is 1831613.

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 a de Polignac number, because none of the positive numbers 2^k-3161381 is a prime.

It is a super-2 number, since 2×3161381² = 19988659654322, 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 (3161321) 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, 4445 + ... + 5106.

It is an arithmetic number, because the mean of its divisors is an integer number (792816).

Almost surely, 2^3161381 is an apocalyptic number.

It is an amenable number.

3161381 is a deficient number, since it is larger than the sum of its proper divisors (9883).

3161381 is an equidigital number, since it uses as much as digits as its factorization.

3161381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9882.

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

The square root of 3161381 is about 1778.0272776310. The cubic root of 3161381 is about 146.7660523580.

Adding to 3161381 its reverse (1831613), we get a palindrome (4992994).

The spelling of 3161381 in words is "three million, one hundred sixty-one thousand, three hundred eighty-one".