1781481494 has 16 divisors (see below), whose sum is σ = 2910116160. Its totient is φ = 812982720.

The previous prime is 1781481487. The next prime is 1781481497. The reversal of 1781481494 is 4941841871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781481497) 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 in 7 ways as a sum of consecutive naturals, for example, 382622 + ... + 387249.

It is an arithmetic number, because the mean of its divisors is an integer number (181882260).

Almost surely, 2^1781481494 is an apocalyptic number.

1781481494 is a deficient number, since it is larger than the sum of its proper divisors (1128634666).

1781481494 is a wasteful number, since it uses less digits than its factorization.

1781481494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769975.

The product of its digits is 258048, while the sum is 47.

The square root of 1781481494 is about 42207.5999554583. The cubic root of 1781481494 is about 1212.2544073952.

The spelling of 1781481494 in words is "one billion, seven hundred eighty-one million, four hundred eighty-one thousand, four hundred ninety-four".