1781012026 has 4 divisors (see below), whose sum is σ = 2671518042. Its totient is φ = 890506012.

The previous prime is 1781012017. The next prime is 1781012027. The reversal of 1781012026 is 6202101871.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1186871401 + 594140625 = 34451^2 + 24375^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1781011985 and 1781012003.

It is not an unprimeable number, because it can be changed into a prime (1781012027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445253005 + ... + 445253008.

Almost surely, 2^1781012026 is an apocalyptic number.

1781012026 is a deficient number, since it is larger than the sum of its proper divisors (890506016).

1781012026 is an equidigital number, since it uses as much as digits as its factorization.

1781012026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890506015.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 1781012026 is about 42202.0381735290. The cubic root of 1781012026 is about 1212.1479108915.

Adding to 1781012026 its reverse (6202101871), we get a palindrome (7983113897).

The spelling of 1781012026 in words is "one billion, seven hundred eighty-one million, twelve thousand, twenty-six".