3691481 has 4 divisors (see below), whose sum is σ = 3695412. Its totient is φ = 3687552.

The previous prime is 3691469. The next prime is 3691489. The reversal of 3691481 is 1841963.

It is a happy number.

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: 1841963 = 241 ⋅7643.

It can be written as a sum of positive squares in 2 ways, for example, as 855625 + 2835856 = 925^2 + 1684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3691481 is a prime.

It is a super-2 number, since 2×3691481² = 27254063946722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3691489) 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, 365 + ... + 2741.

It is an arithmetic number, because the mean of its divisors is an integer number (923853).

Almost surely, 2^3691481 is an apocalyptic number.

It is an amenable number.

3691481 is a deficient number, since it is larger than the sum of its proper divisors (3931).

3691481 is a wasteful number, since it uses less digits than its factorization.

3691481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930.

The product of its digits is 5184, while the sum is 32.

The square root of 3691481 is about 1921.3227214604. The cubic root of 3691481 is about 154.5492419225.

The spelling of 3691481 in words is "three million, six hundred ninety-one thousand, four hundred eighty-one".