3781120001 has 4 divisors (see below), whose sum is σ = 3781425600. Its totient is φ = 3780814404.

The previous prime is 3781119971. The next prime is 3781120033. The reversal of 3781120001 is 1000211873.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1000211873 = 523 ⋅1912451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3781120001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3781120051) 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, 133421 + ... + 159258.

It is an arithmetic number, because the mean of its divisors is an integer number (945356400).

Almost surely, 2^3781120001 is an apocalyptic number.

It is an amenable number.

3781120001 is a deficient number, since it is larger than the sum of its proper divisors (305599).

3781120001 is a wasteful number, since it uses less digits than its factorization.

3781120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305598.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 3781120001 is about 61490.8123299733. The cubic root of 3781120001 is about 1557.9020671770.

Adding to 3781120001 its reverse (1000211873), we get a palindrome (4781331874).

The spelling of 3781120001 in words is "three billion, seven hundred eighty-one million, one hundred twenty thousand, one".