3645961 has 4 divisors (see below), whose sum is σ = 3977424. Its totient is φ = 3314500.

The previous prime is 3645959. The next prime is 3645977. The reversal of 3645961 is 1695463.

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 not a de Polignac number, because 3645961 - 2¹ = 3645959 is a prime.

It is a super-2 number, since 2×3645961² = 26586063227042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3643961) 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, 165715 + ... + 165736.

It is an arithmetic number, because the mean of its divisors is an integer number (994356).

Almost surely, 2^3645961 is an apocalyptic number.

It is an amenable number.

3645961 is a deficient number, since it is larger than the sum of its proper divisors (331463).

3645961 is a wasteful number, since it uses less digits than its factorization.

3645961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331462.

The product of its digits is 19440, while the sum is 34.

The square root of 3645961 is about 1909.4399702531. The cubic root of 3645961 is about 153.9113590074.

The spelling of 3645961 in words is "three million, six hundred forty-five thousand, nine hundred sixty-one".