1381518101 has 4 divisors (see below), whose sum is σ = 1454229600. Its totient is φ = 1308806604.

The previous prime is 1381518079. The next prime is 1381518119. The reversal of 1381518101 is 1018151831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381518101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381518121) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36355721 + ... + 36355758.

It is an arithmetic number, because the mean of its divisors is an integer number (363557400).

Almost surely, 2^1381518101 is an apocalyptic number.

It is an amenable number.

1381518101 is a deficient number, since it is larger than the sum of its proper divisors (72711499).

1381518101 is an equidigital number, since it uses as much as digits as its factorization.

1381518101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72711498.

The product of its (nonzero) digits is 960, while the sum is 29.

The square root of 1381518101 is about 37168.7785782638. The cubic root of 1381518101 is about 1113.7443823749.

Adding to 1381518101 its reverse (1018151831), we get a palindrome (2399669932).

The spelling of 1381518101 in words is "one billion, three hundred eighty-one million, five hundred eighteen thousand, one hundred one".