1812377657 has 2 divisors, whose sum is σ = 1812377658. Its totient is φ = 1812377656.

The previous prime is 1812377647. The next prime is 1812377659. The reversal of 1812377657 is 7567732181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1812290041 + 87616 = 42571^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812377657 - 2⁴ = 1812377641 is a prime.

Together with 1812377659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1812377659) 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, 906188828 + 906188829.

It is an arithmetic number, because the mean of its divisors is an integer number (906188829).

Almost surely, 2^1812377657 is an apocalyptic number.

It is an amenable number.

1812377657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812377657 is an equidigital number, since it uses as much as digits as its factorization.

1812377657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 47.

The square root of 1812377657 is about 42572.0290449022. The cubic root of 1812377657 is about 1219.2223067001. Note that the first 3 decimals are identical.

The spelling of 1812377657 in words is "one billion, eight hundred twelve million, three hundred seventy-seven thousand, six hundred fifty-seven".