388945131 has 4 divisors (see below), whose sum is σ = 518593512. Its totient is φ = 259296752.

The previous prime is 388945121. The next prime is 388945133. The reversal of 388945131 is 131549883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131549883 = 3 ⋅43849961.

It is a cyclic number.

It is not a de Polignac number, because 388945131 - 2¹³ = 388936939 is a prime.

It is a super-2 number, since 2×388945131² = 302556629857214322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388945133) 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, 64824186 + ... + 64824191.

It is an arithmetic number, because the mean of its divisors is an integer number (129648378).

Almost surely, 2^388945131 is an apocalyptic number.

388945131 is a deficient number, since it is larger than the sum of its proper divisors (129648381).

388945131 is a wasteful number, since it uses less digits than its factorization.

388945131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129648380.

The product of its digits is 103680, while the sum is 42.

The square root of 388945131 is about 19721.6918898963. The cubic root of 388945131 is about 729.9550425807.

The spelling of 388945131 in words is "three hundred eighty-eight million, nine hundred forty-five thousand, one hundred thirty-one".