1345135261 has 2 divisors, whose sum is σ = 1345135262. Its totient is φ = 1345135260.

The previous prime is 1345135249. The next prime is 1345135273. The reversal of 1345135261 is 1625315431.

It is a balanced prime because it is at equal distance from previous prime (1345135249) and next prime (1345135273).

It can be written as a sum of positive squares in only one way, i.e., 1039095225 + 306040036 = 32235^2 + 17494^2 .

It is an emirp because it is prime and its reverse (1625315431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1345135261 - 2¹⁹ = 1344610973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345135201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672567630 + 672567631.

It is an arithmetic number, because the mean of its divisors is an integer number (672567631).

Almost surely, 2^1345135261 is an apocalyptic number.

It is an amenable number.

1345135261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345135261 is an equidigital number, since it uses as much as digits as its factorization.

1345135261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 1345135261 is about 36676.0856826352. The cubic root of 1345135261 is about 1103.8803072142.

The spelling of 1345135261 in words is "one billion, three hundred forty-five million, one hundred thirty-five thousand, two hundred sixty-one".