1781626113 has 6 divisors (see below), whose sum is σ = 2573459954. Its totient is φ = 1187750736.

The previous prime is 1781626103. The next prime is 1781626117. The reversal of 1781626113 is 3116261871.

1781626113 is a `hidden beast` number, since 17 + 8 + 1 + 626 + 1 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1586269584 + 195356529 = 39828^2 + 13977^2 .

It is not a de Polignac number, because 1781626113 - 2⁴ = 1781626097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1781626117) 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 5 ways as a sum of consecutive naturals, for example, 98979220 + ... + 98979237.

Almost surely, 2^1781626113 is an apocalyptic number.

It is an amenable number.

1781626113 is a deficient number, since it is larger than the sum of its proper divisors (791833841).

1781626113 is a wasteful number, since it uses less digits than its factorization.

1781626113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197958463 (or 197958460 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1781626113 is about 42209.3131074174. The cubic root of 1781626113 is about 1212.2872097336.

Adding to 1781626113 its reverse (3116261871), we get a palindrome (4897887984).

The spelling of 1781626113 in words is "one billion, seven hundred eighty-one million, six hundred twenty-six thousand, one hundred thirteen".