2403553 has 2 divisors, whose sum is σ = 2403554. Its totient is φ = 2403552.

The previous prime is 2403551. The next prime is 2403581. The reversal of 2403553 is 3553042.

2403553 is nontrivially palindromic in base 6.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2331729 + 71824 = 1527^2 + 268^2 .

It is a cyclic number.

It is not a de Polignac number, because 2403553 - 2¹ = 2403551 is a prime.

Together with 2403551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2403551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1201776 + 1201777.

It is an arithmetic number, because the mean of its divisors is an integer number (1201777).

2^2403553 is an apocalyptic number.

It is an amenable number.

2403553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2403553 is an equidigital number, since it uses as much as digits as its factorization.

2403553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 2403553 is about 1550.3396402079. The cubic root of 2403553 is about 133.9526267530.

Adding to 2403553 its reverse (3553042), we get a palindrome (5956595).

The spelling of 2403553 in words is "two million, four hundred three thousand, five hundred fifty-three".