340520231 has 2 divisors, whose sum is σ = 340520232. Its totient is φ = 340520230.

The previous prime is 340520209. The next prime is 340520303. The reversal of 340520231 is 132025043.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340520231 is a prime.

It is a super-2 number, since 2×340520231² = 231908055440586722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340528231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170260115 + 170260116.

It is an arithmetic number, because the mean of its divisors is an integer number (170260116).

Almost surely, 2^340520231 is an apocalyptic number.

340520231 is a deficient number, since it is larger than the sum of its proper divisors (1).

340520231 is an equidigital number, since it uses as much as digits as its factorization.

340520231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 340520231 is about 18453.1902661843. The cubic root of 340520231 is about 698.3090006325.

Adding to 340520231 its reverse (132025043), we get a palindrome (472545274).

The spelling of 340520231 in words is "three hundred forty million, five hundred twenty thousand, two hundred thirty-one".