1378201085 has 4 divisors (see below), whose sum is σ = 1653841308. Its totient is φ = 1102560864.

The previous prime is 1378201063. The next prime is 1378201087. The reversal of 1378201085 is 5801028731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5801028731 = 73 ⋅79466147.

It can be written as a sum of positive squares in 2 ways, for example, as 826045081 + 552156004 = 28741^2 + 23498^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378201085 - 2⁶ = 1378201021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378201087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137820104 + ... + 137820113.

It is an arithmetic number, because the mean of its divisors is an integer number (413460327).

Almost surely, 2^1378201085 is an apocalyptic number.

It is an amenable number.

1378201085 is a deficient number, since it is larger than the sum of its proper divisors (275640223).

1378201085 is an equidigital number, since it uses as much as digits as its factorization.

1378201085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275640222.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 1378201085 is about 37124.1307642347. The cubic root of 1378201085 is about 1112.8523036890.

The spelling of 1378201085 in words is "one billion, three hundred seventy-eight million, two hundred one thousand, eighty-five".