340503521 has 2 divisors, whose sum is σ = 340503522. Its totient is φ = 340503520.

The previous prime is 340503511. The next prime is 340503551. The reversal of 340503521 is 125305043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294602896 + 45900625 = 17164^2 + 6775^2 .

It is a cyclic number.

It is not a de Polignac number, because 340503521 - 2²⁶ = 273394657 is a prime.

It is not a weakly prime, because it can be changed into another prime (340503511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170251760 + 170251761.

It is an arithmetic number, because the mean of its divisors is an integer number (170251761).

Almost surely, 2^340503521 is an apocalyptic number.

It is an amenable number.

340503521 is a deficient number, since it is larger than the sum of its proper divisors (1).

340503521 is an equidigital number, since it uses as much as digits as its factorization.

340503521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 340503521 is about 18452.7374933911. The cubic root of 340503521 is about 698.2975779786.

Adding to 340503521 its reverse (125305043), we get a palindrome (465808564).

The spelling of 340503521 in words is "three hundred forty million, five hundred three thousand, five hundred twenty-one".