1813281377 has 2 divisors, whose sum is σ = 1813281378. Its totient is φ = 1813281376.

The previous prime is 1813281361. The next prime is 1813281389. The reversal of 1813281377 is 7731823181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069028416 + 744252961 = 32696^2 + 27281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813281377 - 2⁴ = 1813281361 is a prime.

It is a super-2 number, since 2×1813281377² = 6575978704350032258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1813211377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906640688 + 906640689.

It is an arithmetic number, because the mean of its divisors is an integer number (906640689).

Almost surely, 2^1813281377 is an apocalyptic number.

It is an amenable number.

1813281377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813281377 is an equidigital number, since it uses as much as digits as its factorization.

1813281377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 1813281377 is about 42582.6417334575. The cubic root of 1813281377 is about 1219.4249231343.

The spelling of 1813281377 in words is "one billion, eight hundred thirteen million, two hundred eighty-one thousand, three hundred seventy-seven".