381557539 has 4 divisors (see below), whose sum is σ = 416244600. Its totient is φ = 346870480.

The previous prime is 381557489. The next prime is 381557581. The reversal of 381557539 is 935755183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935755183 = 11 ⋅85068653.

It is not a de Polignac number, because 381557539 - 2¹⁵ = 381524771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381557599) 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, 17343514 + ... + 17343535.

It is an arithmetic number, because the mean of its divisors is an integer number (104061150).

Almost surely, 2^381557539 is an apocalyptic number.

381557539 is a deficient number, since it is larger than the sum of its proper divisors (34687061).

381557539 is a wasteful number, since it uses less digits than its factorization.

381557539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34687060.

The product of its digits is 567000, while the sum is 46.

The square root of 381557539 is about 19533.4978690454. The cubic root of 381557539 is about 725.3039004986.

The spelling of 381557539 in words is "three hundred eighty-one million, five hundred fifty-seven thousand, five hundred thirty-nine".