381500557 has 4 divisors (see below), whose sum is σ = 381789376. Its totient is φ = 381211740.

The previous prime is 381500503. The next prime is 381500569. The reversal of 381500557 is 755005183.

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, and also an emirpimes, since its reverse is a distinct semiprime: 755005183 = 16363 ⋅46141.

It is a cyclic number.

It is not a de Polignac number, because 381500557 - 2¹⁵ = 381467789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381500657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142419 + ... + 145072.

It is an arithmetic number, because the mean of its divisors is an integer number (95447344).

Almost surely, 2^381500557 is an apocalyptic number.

It is an amenable number.

381500557 is a deficient number, since it is larger than the sum of its proper divisors (288819).

381500557 is a wasteful number, since it uses less digits than its factorization.

381500557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288818.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 381500557 is about 19532.0392432536. The cubic root of 381500557 is about 725.2677929480.

The spelling of 381500557 in words is "three hundred eighty-one million, five hundred thousand, five hundred fifty-seven".