381868451 has 4 divisors (see below), whose sum is σ = 383088792. Its totient is φ = 380648112.

The previous prime is 381868439. The next prime is 381868489. The reversal of 381868451 is 154868183.

It is a happy number.

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 381868451 - 2⁶ = 381868387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381868351) 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, 609701 + ... + 610326.

It is an arithmetic number, because the mean of its divisors is an integer number (95772198).

Almost surely, 2^381868451 is an apocalyptic number.

381868451 is a deficient number, since it is larger than the sum of its proper divisors (1220341).

381868451 is a wasteful number, since it uses less digits than its factorization.

381868451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220340.

The product of its digits is 184320, while the sum is 44.

The square root of 381868451 is about 19541.4546797315. The cubic root of 381868451 is about 725.5008515391.

The spelling of 381868451 in words is "three hundred eighty-one million, eight hundred sixty-eight thousand, four hundred fifty-one".