2356621 has 2 divisors, whose sum is σ = 2356622. Its totient is φ = 2356620.

The previous prime is 2356609. The next prime is 2356643. The reversal of 2356621 is 1266532.

2356621 = 1085² + 1086².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1179396 + 1177225 = 1086^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 2356621 - 2¹³ = 2348429 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2356661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1178310 + 1178311.

It is an arithmetic number, because the mean of its divisors is an integer number (1178311).

2^2356621 is an apocalyptic number.

2356621 is the 1086-th centered square number.

It is an amenable number.

2356621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2356621 is an equidigital number, since it uses as much as digits as its factorization.

2356621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 2356621 is about 1535.1289848088. The cubic root of 2356621 is about 133.0750325674.

It can be divided in two parts, 23 and 56621, that added together give a square (56644 = 238²).

The spelling of 2356621 in words is "two million, three hundred fifty-six thousand, six hundred twenty-one".