381459521 has 4 divisors (see below), whose sum is σ = 382287444. Its totient is φ = 380631600.

The previous prime is 381459503. The next prime is 381459553. The reversal of 381459521 is 125954183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125954183 = 907 ⋅138869.

It can be written as a sum of positive squares in 2 ways, for example, as 146143921 + 235315600 = 12089^2 + 15340^2 .

It is a cyclic number.

It is not a de Polignac number, because 381459521 - 2²⁶ = 314350657 is a prime.

It is a super-2 number, since 2×381459521² = 291022732323098882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381450521) 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, 413270 + ... + 414191.

It is an arithmetic number, because the mean of its divisors is an integer number (95571861).

Almost surely, 2^381459521 is an apocalyptic number.

It is an amenable number.

381459521 is a deficient number, since it is larger than the sum of its proper divisors (827923).

381459521 is an equidigital number, since it uses as much as digits as its factorization.

381459521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827922.

The product of its digits is 43200, while the sum is 38.

The square root of 381459521 is about 19530.9887358526. The cubic root of 381459521 is about 725.2417876069.

The spelling of 381459521 in words is "three hundred eighty-one million, four hundred fifty-nine thousand, five hundred twenty-one".