1081862381 has 4 divisors (see below), whose sum is σ = 1084327200. Its totient is φ = 1079397564.

The previous prime is 1081862347. The next prime is 1081862393. The reversal of 1081862381 is 1832681801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1832681801 = 43 ⋅42620507.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081862381 is a prime.

It is a super-2 number, since 2×1081862381² = 2340852422845978322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081862281) 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 in 3 ways as a sum of consecutive naturals, for example, 1231751 + ... + 1232628.

It is an arithmetic number, because the mean of its divisors is an integer number (271081800).

Almost surely, 2^1081862381 is an apocalyptic number.

It is an amenable number.

1081862381 is a deficient number, since it is larger than the sum of its proper divisors (2464819).

1081862381 is an equidigital number, since it uses as much as digits as its factorization.

1081862381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464818.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1081862381 is about 32891.6764698913. The cubic root of 1081862381 is about 1026.5749750270.

The spelling of 1081862381 in words is "one billion, eighty-one million, eight hundred sixty-two thousand, three hundred eighty-one".