1375781165 has 16 divisors (see below), whose sum is σ = 1895814720. Its totient is φ = 947905920.

The previous prime is 1375781161. The next prime is 1375781233. The reversal of 1375781165 is 5611875731.

It is not a de Polignac number, because 1375781165 - 2² = 1375781161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375781161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657224 + ... + 659313.

It is an arithmetic number, because the mean of its divisors is an integer number (118488420).

Almost surely, 2^1375781165 is an apocalyptic number.

It is an amenable number.

1375781165 is a deficient number, since it is larger than the sum of its proper divisors (520033555).

1375781165 is a wasteful number, since it uses less digits than its factorization.

1375781165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316572.

The product of its digits is 176400, while the sum is 44.

The square root of 1375781165 is about 37091.5241665802. The cubic root of 1375781165 is about 1112.2005866803.

The spelling of 1375781165 in words is "one billion, three hundred seventy-five million, seven hundred eighty-one thousand, one hundred sixty-five".