340662521 has 2 divisors, whose sum is σ = 340662522. Its totient is φ = 340662520.

The previous prime is 340662479. The next prime is 340662529. The reversal of 340662521 is 125266043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214212496 + 126450025 = 14636^2 + 11245^2 .

It is a cyclic number.

It is not a de Polignac number, because 340662521 - 2¹⁸ = 340400377 is a prime.

It is a Chen prime.

It is equal to p_18328502 and since 340662521 and 18328502 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (340662529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170331260 + 170331261.

It is an arithmetic number, because the mean of its divisors is an integer number (170331261).

Almost surely, 2^340662521 is an apocalyptic number.

It is an amenable number.

340662521 is a deficient number, since it is larger than the sum of its proper divisors (1).

340662521 is an equidigital number, since it uses as much as digits as its factorization.

340662521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 340662521 is about 18457.0452944126. The cubic root of 340662521 is about 698.4062523687.

The spelling of 340662521 in words is "three hundred forty million, six hundred sixty-two thousand, five hundred twenty-one".