381556489 has 4 divisors (see below), whose sum is σ = 381783556. Its totient is φ = 381329424.

The previous prime is 381556477. The next prime is 381556493. The reversal of 381556489 is 984655183.

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

It can be written as a sum of positive squares in 2 ways, for example, as 201782025 + 179774464 = 14205^2 + 13408^2 .

It is a cyclic number.

It is not a de Polignac number, because 381556489 - 2¹⁷ = 381425417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381556429) 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, 110994 + ... + 114379.

It is an arithmetic number, because the mean of its divisors is an integer number (95445889).

Almost surely, 2^381556489 is an apocalyptic number.

It is an amenable number.

381556489 is a deficient number, since it is larger than the sum of its proper divisors (227067).

381556489 is a wasteful number, since it uses less digits than its factorization.

381556489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227066.

The product of its digits is 1036800, while the sum is 49.

The square root of 381556489 is about 19533.4709921202. The cubic root of 381556489 is about 725.3032351819.

It can be divided in two parts, 38155 and 6489, that added together give a palindrome (44644).

The spelling of 381556489 in words is "three hundred eighty-one million, five hundred fifty-six thousand, four hundred eighty-nine".