1020436381 has 2 divisors, whose sum is σ = 1020436382. Its totient is φ = 1020436380.

The previous prime is 1020436349. The next prime is 1020436429. The reversal of 1020436381 is 1836340201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 675740025 + 344696356 = 25995^2 + 18566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020436381 - 2⁵ = 1020436349 is a prime.

It is a super-2 number, since 2×1020436381² = 2082580815336754322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020436321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510218190 + 510218191.

It is an arithmetic number, because the mean of its divisors is an integer number (510218191).

Almost surely, 2^1020436381 is an apocalyptic number.

It is an amenable number.

1020436381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020436381 is an equidigital number, since it uses as much as digits as its factorization.

1020436381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1020436381 is about 31944.2699243542. The cubic root of 1020436381 is about 1006.7662417156.

Adding to 1020436381 its reverse (1836340201), we get a palindrome (2856776582).

The spelling of 1020436381 in words is "one billion, twenty million, four hundred thirty-six thousand, three hundred eighty-one".