381733557 has 4 divisors (see below), whose sum is σ = 508978080. Its totient is φ = 254489036.

The previous prime is 381733537. The next prime is 381733621. The reversal of 381733557 is 755337183.

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 381733557 - 2¹⁸ = 381471413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381733537) 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, 63622257 + ... + 63622262.

It is an arithmetic number, because the mean of its divisors is an integer number (127244520).

Almost surely, 2^381733557 is an apocalyptic number.

It is an amenable number.

381733557 is a deficient number, since it is larger than the sum of its proper divisors (127244523).

381733557 is a wasteful number, since it uses less digits than its factorization.

381733557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127244522.

The product of its digits is 264600, while the sum is 42.

The square root of 381733557 is about 19538.0028918004. The cubic root of 381733557 is about 725.4154144054.

The spelling of 381733557 in words is "three hundred eighty-one million, seven hundred thirty-three thousand, five hundred fifty-seven".