3666961 has 2 divisors, whose sum is σ = 3666962. Its totient is φ = 3666960.

The previous prime is 3666947. The next prime is 3666979. The reversal of 3666961 is 1696663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2822400 + 844561 = 1680^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 3666961 - 2⁷ = 3666833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3666961.

It is not a weakly prime, because it can be changed into another prime (3666991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1833480 + 1833481.

It is an arithmetic number, because the mean of its divisors is an integer number (1833481).

Almost surely, 2^3666961 is an apocalyptic number.

It is an amenable number.

3666961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666961 is an equidigital number, since it uses as much as digits as its factorization.

3666961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The square root of 3666961 is about 1914.9310692555. The cubic root of 3666961 is about 154.2062929385.

The spelling of 3666961 in words is "three million, six hundred sixty-six thousand, nine hundred sixty-one".