3101861 has 4 divisors (see below), whose sum is σ = 3544992. Its totient is φ = 2658732.

The previous prime is 3101851. The next prime is 3101863. The reversal of 3101861 is 1681013.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1681013 = 271 ⋅6203.

It is a cyclic number.

It is not a de Polignac number, because 3101861 - 2¹⁴ = 3085477 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 (3101863) 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, 221555 + ... + 221568.

It is an arithmetic number, because the mean of its divisors is an integer number (886248).

Almost surely, 2^3101861 is an apocalyptic number.

It is an amenable number.

3101861 is a deficient number, since it is larger than the sum of its proper divisors (443131).

3101861 is an equidigital number, since it uses as much as digits as its factorization.

3101861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443130.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 3101861 is about 1761.2100953606. The cubic root of 3101861 is about 145.8391454192.

Adding to 3101861 its reverse (1681013), we get a palindrome (4782874).

The spelling of 3101861 in words is "three million, one hundred one thousand, eight hundred sixty-one".