1781085245149 has 8 divisors (see below), whose sum is σ = 2070026435520. Its totient is φ = 1500769165056.

The previous prime is 1781085245119. The next prime is 1781085245161. The reversal of 1781085245149 is 9415425801871.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1781085245149 - 2³¹ = 1778937761501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1781085245149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781085245119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2156277124 + ... + 2156277949.

It is an arithmetic number, because the mean of its divisors is an integer number (258753304440).

Almost surely, 2^{1781085245149} is an apocalyptic number.

It is an amenable number.

1781085245149 is a deficient number, since it is larger than the sum of its proper divisors (288941190371).

1781085245149 is an equidigital number, since it uses as much as digits as its factorization.

1781085245149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4312555139.

The product of its (nonzero) digits is 3225600, while the sum is 55.

The spelling of 1781085245149 in words is "one trillion, seven hundred eighty-one billion, eighty-five million, two hundred forty-five thousand, one hundred forty-nine".