3643951 has 2 divisors, whose sum is σ = 3643952. Its totient is φ = 3643950.

The previous prime is 3643921. The next prime is 3643961. The reversal of 3643951 is 1593463.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3643951 - 2⁵ = 3643919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3643901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821975 + 1821976.

It is an arithmetic number, because the mean of its divisors is an integer number (1821976).

Almost surely, 2^3643951 is an apocalyptic number.

3643951 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643951 is an equidigital number, since it uses as much as digits as its factorization.

3643951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 3643951 is about 1908.9135653560. The cubic root of 3643951 is about 153.8830702884.

The spelling of 3643951 in words is "three million, six hundred forty-three thousand, nine hundred fifty-one".