1375811955 has 144 divisors (see below), whose sum is σ = 2970639360. Its totient is φ = 587284992.

The previous prime is 1375811917. The next prime is 1375811963. The reversal of 1375811955 is 5591185731.

1375811955 is a `hidden beast` number, since 1 + 3 + 7 + 581 + 19 + 55 = 666.

It is not a de Polignac number, because 1375811955 - 2¹³ = 1375803763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1375811955.

It is an unprimeable number.

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 143 ways as a sum of consecutive naturals, for example, 10833102 + ... + 10833228.

It is an arithmetic number, because the mean of its divisors is an integer number (20629440).

Almost surely, 2^1375811955 is an apocalyptic number.

1375811955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1375811955 is an abundant number, since it is smaller than the sum of its proper divisors (1594827405).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1375811955 is a wasteful number, since it uses less digits than its factorization.

1375811955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 159 counting only the distinct ones).

The product of its digits is 189000, while the sum is 45.

The square root of 1375811955 is about 37091.9392186496. The cubic root of 1375811955 is about 1112.2088836395.

The spelling of 1375811955 in words is "one billion, three hundred seventy-five million, eight hundred eleven thousand, nine hundred fifty-five".