3651941 has 4 divisors (see below), whose sum is σ = 3777900. Its totient is φ = 3525984.

The previous prime is 3651929. The next prime is 3651943. The reversal of 3651941 is 1491563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1491563 = 17 ⋅87739.

It can be written as a sum of positive squares in 2 ways, for example, as 2788900 + 863041 = 1670^2 + 929^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651941 - 2¹⁸ = 3389797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 125929 = 3651941 / (3 + 6 + 5 + 1 + 9 + 4 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651943) 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, 62936 + ... + 62993.

It is an arithmetic number, because the mean of its divisors is an integer number (944475).

Almost surely, 2^3651941 is an apocalyptic number.

It is an amenable number.

3651941 is a deficient number, since it is larger than the sum of its proper divisors (125959).

3651941 is a wasteful number, since it uses less digits than its factorization.

3651941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125958.

The product of its digits is 3240, while the sum is 29.

The square root of 3651941 is about 1911.0052328552. The cubic root of 3651941 is about 153.9954600337.

The spelling of 3651941 in words is "three million, six hundred fifty-one thousand, nine hundred forty-one".