2238641813 has 2 divisors, whose sum is σ = 2238641814. Its totient is φ = 2238641812.

The previous prime is 2238641809. The next prime is 2238641879. The reversal of 2238641813 is 3181468322.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2229539524 + 9102289 = 47218^2 + 3017^2 .

It is a cyclic number.

It is not a de Polignac number, because 2238641813 - 2² = 2238641809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2238641803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1119320906 + 1119320907.

It is an arithmetic number, because the mean of its divisors is an integer number (1119320907).

Almost surely, 2^2238641813 is an apocalyptic number.

It is an amenable number.

2238641813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2238641813 is an equidigital number, since it uses as much as digits as its factorization.

2238641813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 2238641813 is about 47314.2876201259. The cubic root of 2238641813 is about 1308.1620230061.

The spelling of 2238641813 in words is "two billion, two hundred thirty-eight million, six hundred forty-one thousand, eight hundred thirteen".