340661261 has 2 divisors, whose sum is σ = 340661262. Its totient is φ = 340661260.

The previous prime is 340661219. The next prime is 340661281. The reversal of 340661261 is 162166043.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215355625 + 125305636 = 14675^2 + 11194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340661261 is a prime.

It is a super-2 number, since 2×340661261² = 232100189492220242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340661281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170330630 + 170330631.

It is an arithmetic number, because the mean of its divisors is an integer number (170330631).

Almost surely, 2^340661261 is an apocalyptic number.

It is an amenable number.

340661261 is a deficient number, since it is larger than the sum of its proper divisors (1).

340661261 is an equidigital number, since it uses as much as digits as its factorization.

340661261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 340661261 is about 18457.0111610737. The cubic root of 340661261 is about 698.4053913084.

The spelling of 340661261 in words is "three hundred forty million, six hundred sixty-one thousand, two hundred sixty-one".