381781001 has 12 divisors (see below), whose sum is σ = 447062400. Its totient is φ = 325067400.

The previous prime is 381780991. The next prime is 381781069. The reversal of 381781001 is 100187183.

It is not a de Polignac number, because 381781001 - 2⁶ = 381780937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381781601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18401 + ... + 33198.

It is an arithmetic number, because the mean of its divisors is an integer number (37255200).

Almost surely, 2^381781001 is an apocalyptic number.

It is an amenable number.

381781001 is a deficient number, since it is larger than the sum of its proper divisors (65281399).

381781001 is a wasteful number, since it uses less digits than its factorization.

381781001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51764 (or 51757 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 381781001 is about 19539.2170006886. The cubic root of 381781001 is about 725.4454660671.

The spelling of 381781001 in words is "three hundred eighty-one million, seven hundred eighty-one thousand, one".