1350385781 has 8 divisors (see below), whose sum is σ = 1413052344. Its totient is φ = 1289096640.

The previous prime is 1350385753. The next prime is 1350385819. The reversal of 1350385781 is 1875830531.

It can be written as a sum of positive squares in 4 ways, for example, as 354983281 + 995402500 = 18841^2 + 31550^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1350385781 - 2¹⁰ = 1350384757 is a prime.

It is a super-2 number, since 2×1350385781² = 3647083515053959922, 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 (1350385711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342350 + ... + 346271.

It is an arithmetic number, because the mean of its divisors is an integer number (176631543).

Almost surely, 2^1350385781 is an apocalyptic number.

It is an amenable number.

1350385781 is a deficient number, since it is larger than the sum of its proper divisors (62666563).

1350385781 is an equidigital number, since it uses as much as digits as its factorization.

1350385781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688711.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 1350385781 is about 36747.5955812078. The cubic root of 1350385781 is about 1105.3147158142.

The spelling of 1350385781 in words is "one billion, three hundred fifty million, three hundred eighty-five thousand, seven hundred eighty-one".