1346378261 has 2 divisors, whose sum is σ = 1346378262. Its totient is φ = 1346378260.

The previous prime is 1346378221. The next prime is 1346378269. The reversal of 1346378261 is 1628736431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817102225 + 529276036 = 28585^2 + 23006^2 .

It is a cyclic number.

It is not a de Polignac number, because 1346378261 - 2⁶ = 1346378197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1346378269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673189130 + 673189131.

It is an arithmetic number, because the mean of its divisors is an integer number (673189131).

Almost surely, 2^1346378261 is an apocalyptic number.

It is an amenable number.

1346378261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1346378261 is an equidigital number, since it uses as much as digits as its factorization.

1346378261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 1346378261 is about 36693.0274166632. The cubic root of 1346378261 is about 1104.2202236603.

The spelling of 1346378261 in words is "one billion, three hundred forty-six million, three hundred seventy-eight thousand, two hundred sixty-one".