1813229657 has 2 divisors, whose sum is σ = 1813229658. Its totient is φ = 1813229656.

The previous prime is 1813229653. The next prime is 1813229681. The reversal of 1813229657 is 7569223181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 930189001 + 883040656 = 30499^2 + 29716^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813229657 - 2² = 1813229653 is a prime.

It is not a weakly prime, because it can be changed into another prime (1813229651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906614828 + 906614829.

It is an arithmetic number, because the mean of its divisors is an integer number (906614829).

Almost surely, 2^1813229657 is an apocalyptic number.

It is an amenable number.

1813229657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813229657 is an equidigital number, since it uses as much as digits as its factorization.

1813229657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 1813229657 is about 42582.0344394206. The cubic root of 1813229657 is about 1219.4133291887.

The spelling of 1813229657 in words is "one billion, eight hundred thirteen million, two hundred twenty-nine thousand, six hundred fifty-seven".