2356661 has 2 divisors, whose sum is σ = 2356662. Its totient is φ = 2356660.

The previous prime is 2356643. The next prime is 2356663. The reversal of 2356661 is 1666532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 1168561 = 1090^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 2356661 - 2⁶ = 2356597 is a prime.

It is a Sophie Germain prime.

Together with 2356663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2356663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1178330 + 1178331.

It is an arithmetic number, because the mean of its divisors is an integer number (1178331).

2^2356661 is an apocalyptic number.

It is an amenable number.

2356661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2356661 is an equidigital number, since it uses as much as digits as its factorization.

2356661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 2356661 is about 1535.1420129747. The cubic root of 2356661 is about 133.0757854775.

The spelling of 2356661 in words is "two million, three hundred fifty-six thousand, six hundred sixty-one".