283520381 has 8 divisors (see below), whose sum is σ = 291447384. Its totient is φ = 275607360.

The previous prime is 283520317. The next prime is 283520387. The reversal of 283520381 is 183025382.

It can be written as a sum of positive squares in 4 ways, for example, as 163968025 + 119552356 = 12805^2 + 10934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 283520381 - 2⁶ = 283520317 is a prime.

It is a super-2 number, since 2×283520381² = 160767612884770322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (283520387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48011 + ... + 53591.

It is an arithmetic number, because the mean of its divisors is an integer number (36430923).

Almost surely, 2^283520381 is an apocalyptic number.

It is an amenable number.

283520381 is a deficient number, since it is larger than the sum of its proper divisors (7927003).

283520381 is a wasteful number, since it uses less digits than its factorization.

283520381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6991.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 283520381 is about 16838.0634575357. The cubic root of 283520381 is about 656.9436129304.

The spelling of 283520381 in words is "two hundred eighty-three million, five hundred twenty thousand, three hundred eighty-one".