1381320135 has 144 divisors (see below), whose sum is σ = 2777523840. Its totient is φ = 655050240.

The previous prime is 1381320133. The next prime is 1381320163. The reversal of 1381320135 is 5310231831.

It is not a de Polignac number, because 1381320135 - 2¹ = 1381320133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1381320099 and 1381320108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381320133) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 17485026 + ... + 17485104.

It is an arithmetic number, because the mean of its divisors is an integer number (19288360).

Almost surely, 2^1381320135 is an apocalyptic number.

1381320135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1381320135 is an abundant number, since it is smaller than the sum of its proper divisors (1396203705).

1381320135 is an frugal number, since it uses more digits than its factorization.

1381320135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1381320135 is about 37166.1154144471. The cubic root of 1381320135 is about 1113.6911814668.

Adding to 1381320135 its reverse (5310231831), we get a palindrome (6691551966).

The spelling of 1381320135 in words is "one billion, three hundred eighty-one million, three hundred twenty thousand, one hundred thirty-five".