1145023381 has 2 divisors, whose sum is σ = 1145023382. Its totient is φ = 1145023380.

The previous prime is 1145023379. The next prime is 1145023403. The reversal of 1145023381 is 1833205411.

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., 924768100 + 220255281 = 30410^2 + 14841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145023381 - 2¹ = 1145023379 is a prime.

It is a super-2 number, since 2×1145023381² = 2622157086073342322, which contains 22 as substring.

Together with 1145023379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145023681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572511690 + 572511691.

It is an arithmetic number, because the mean of its divisors is an integer number (572511691).

Almost surely, 2^1145023381 is an apocalyptic number.

It is an amenable number.

1145023381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145023381 is an equidigital number, since it uses as much as digits as its factorization.

1145023381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1145023381 is about 33838.1941155257. The cubic root of 1145023381 is about 1046.1760775232.

Adding to 1145023381 its reverse (1833205411), we get a palindrome (2978228792).

The spelling of 1145023381 in words is "one billion, one hundred forty-five million, twenty-three thousand, three hundred eighty-one".