1820947313 has 2 divisors, whose sum is σ = 1820947314. Its totient is φ = 1820947312.

The previous prime is 1820947279. The next prime is 1820947319. The reversal of 1820947313 is 3137490281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1696780864 + 124166449 = 41192^2 + 11143^2 .

It is an emirp because it is prime and its reverse (3137490281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820947313 - 2¹² = 1820943217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1820947319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910473656 + 910473657.

It is an arithmetic number, because the mean of its divisors is an integer number (910473657).

Almost surely, 2^1820947313 is an apocalyptic number.

It is an amenable number.

1820947313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820947313 is an equidigital number, since it uses as much as digits as its factorization.

1820947313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1820947313 is about 42672.5592506472. The cubic root of 1820947313 is about 1221.1409448828.

The spelling of 1820947313 in words is "one billion, eight hundred twenty million, nine hundred forty-seven thousand, three hundred thirteen".