381233691 has 48 divisors (see below), whose sum is σ = 584543232. Its totient is φ = 239112000.

The previous prime is 381233669. The next prime is 381233701. The reversal of 381233691 is 196332183.

It is not a de Polignac number, because 381233691 - 2⁶ = 381233627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381233791) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2338776 + ... + 2338938.

It is an arithmetic number, because the mean of its divisors is an integer number (12177984).

Almost surely, 2^381233691 is an apocalyptic number.

381233691 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

381233691 is a deficient number, since it is larger than the sum of its proper divisors (203309541).

381233691 is a wasteful number, since it uses less digits than its factorization.

381233691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 381 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 381233691 is about 19525.2065546053. The cubic root of 381233691 is about 725.0986411961.

It can be divided in two parts, 381233 and 691, that added together give a square (381924 = 618²).

The spelling of 381233691 in words is "three hundred eighty-one million, two hundred thirty-three thousand, six hundred ninety-one".