3891149 has 4 divisors (see below), whose sum is σ = 3895164. Its totient is φ = 3887136.

The previous prime is 3891137. The next prime is 3891157. The reversal of 3891149 is 9411983.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9411983 = 7 ⋅1344569.

It can be written as a sum of positive squares in 2 ways, for example, as 669124 + 3222025 = 818^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891149 - 2¹² = 3887053 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 (3891049) 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, 449 + ... + 2825.

It is an arithmetic number, because the mean of its divisors is an integer number (973791).

Almost surely, 2^3891149 is an apocalyptic number.

It is an amenable number.

3891149 is a deficient number, since it is larger than the sum of its proper divisors (4015).

3891149 is a wasteful number, since it uses less digits than its factorization.

3891149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014.

The product of its digits is 7776, while the sum is 35.

The square root of 3891149 is about 1972.5995538882. The cubic root of 3891149 is about 157.2869244325.

The spelling of 3891149 in words is "three million, eight hundred ninety-one thousand, one hundred forty-nine".