1521623 has 2 divisors, whose sum is σ = 1521624. Its totient is φ = 1521622.

The previous prime is 1521617. The next prime is 1521629. The reversal of 1521623 is 3261251.

It is a balanced prime because it is at equal distance from previous prime (1521617) and next prime (1521629).

It is a cyclic number.

It is not a de Polignac number, because 1521623 - 2¹⁶ = 1456087 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1521595 and 1521604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760811 + 760812.

It is an arithmetic number, because the mean of its divisors is an integer number (760812).

2^1521623 is an apocalyptic number.

1521623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521623 is an equidigital number, since it uses as much as digits as its factorization.

1521623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 1521623 is about 1233.5408383998. The cubic root of 1521623 is about 115.0188500921.

Adding to 1521623 its reverse (3261251), we get a palindrome (4782874).

The spelling of 1521623 in words is "one million, five hundred twenty-one thousand, six hundred twenty-three".