381581601091 has 4 divisors (see below), whose sum is σ = 381615175800. Its totient is φ = 381548026384.

The previous prime is 381581601041. The next prime is 381581601113. The reversal of 381581601091 is 190106185183.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 381581601091 - 2¹⁹ = 381581076803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381581601001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16770301 + ... + 16793038.

It is an arithmetic number, because the mean of its divisors is an integer number (95403793950).

Almost surely, 2^381581601091 is an apocalyptic number.

381581601091 is a deficient number, since it is larger than the sum of its proper divisors (33574709).

381581601091 is a wasteful number, since it uses less digits than its factorization.

381581601091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33574708.

The product of its (nonzero) digits is 51840, while the sum is 43.

The spelling of 381581601091 in words is "three hundred eighty-one billion, five hundred eighty-one million, six hundred one thousand, ninety-one".