1235945813 has 2 divisors, whose sum is σ = 1235945814. Its totient is φ = 1235945812.

The previous prime is 1235945807. The next prime is 1235945863. The reversal of 1235945813 is 3185495321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1111355569 + 124590244 = 33337^2 + 11162^2 .

It is an emirp because it is prime and its reverse (3185495321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1235945813 - 2⁴ = 1235945797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1235945803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617972906 + 617972907.

It is an arithmetic number, because the mean of its divisors is an integer number (617972907).

Almost surely, 2^1235945813 is an apocalyptic number.

It is an amenable number.

1235945813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235945813 is an equidigital number, since it uses as much as digits as its factorization.

1235945813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 1235945813 is about 35156.0210063653. The cubic root of 1235945813 is about 1073.1649422594.

The spelling of 1235945813 in words is "one billion, two hundred thirty-five million, nine hundred forty-five thousand, eight hundred thirteen".