385687412521 has 4 divisors (see below), whose sum is σ = 398986978500. Its totient is φ = 372387846544.

The previous prime is 385687412507. The next prime is 385687412531. The reversal of 385687412521 is 125214786583.

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 80635553296 + 305051859225 = 283964^2 + 552315^2 .

It is a cyclic number.

It is not a de Polignac number, because 385687412521 - 2²⁵ = 385653858089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385687412531) 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, 6649782946 + ... + 6649783003.

It is an arithmetic number, because the mean of its divisors is an integer number (99746744625).

Almost surely, 2^385687412521 is an apocalyptic number.

It is an amenable number.

385687412521 is a deficient number, since it is larger than the sum of its proper divisors (13299565979).

385687412521 is a wasteful number, since it uses less digits than its factorization.

385687412521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13299565978.

The product of its digits is 3225600, while the sum is 52.

The spelling of 385687412521 in words is "three hundred eighty-five billion, six hundred eighty-seven million, four hundred twelve thousand, five hundred twenty-one".