381817669 has 4 divisors (see below), whose sum is σ = 394134400. Its totient is φ = 369500940.

The previous prime is 381817661. The next prime is 381817691. The reversal of 381817669 is 966718183.

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.

It is a cyclic number.

It is not a de Polignac number, because 381817669 - 2³ = 381817661 is a prime.

It is a super-2 number, since 2×381817669² = 291569464721187122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381817661) 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, 6158319 + ... + 6158380.

It is an arithmetic number, because the mean of its divisors is an integer number (98533600).

Almost surely, 2^381817669 is an apocalyptic number.

It is an amenable number.

381817669 is a deficient number, since it is larger than the sum of its proper divisors (12316731).

381817669 is a wasteful number, since it uses less digits than its factorization.

381817669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12316730.

The product of its digits is 435456, while the sum is 49.

The square root of 381817669 is about 19540.1552962099. The cubic root of 381817669 is about 725.4686903612.

The spelling of 381817669 in words is "three hundred eighty-one million, eight hundred seventeen thousand, six hundred sixty-nine".