381957121 has 16 divisors (see below), whose sum is σ = 470675968. Its totient is φ = 301838400.

The previous prime is 381957077. The next prime is 381957137. The reversal of 381957121 is 121759183.

It is a cyclic number.

It is not a de Polignac number, because 381957121 - 2¹¹ = 381955073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381957721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90856 + ... + 94966.

It is an arithmetic number, because the mean of its divisors is an integer number (29417248).

Almost surely, 2^381957121 is an apocalyptic number.

It is an amenable number.

381957121 is a deficient number, since it is larger than the sum of its proper divisors (88718847).

381957121 is a wasteful number, since it uses less digits than its factorization.

381957121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152.

The product of its digits is 15120, while the sum is 37.

The square root of 381957121 is about 19543.7233146604. The cubic root of 381957121 is about 725.5570010515.

The spelling of 381957121 in words is "three hundred eighty-one million, nine hundred fifty-seven thousand, one hundred twenty-one".