284623261 has 4 divisors (see below), whose sum is σ = 306517372. Its totient is φ = 262729152.

The previous prime is 284623253. The next prime is 284623267. The reversal of 284623261 is 162326482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162326482 = 2 ⋅81163241.

It can be written as a sum of positive squares in 2 ways, for example, as 162078361 + 122544900 = 12731^2 + 11070^2 .

It is a cyclic number.

It is not a de Polignac number, because 284623261 - 2³ = 284623253 is a prime.

It is a super-3 number, since 3×284623261³ (a number of 26 digits) contains 333 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 (284623267) 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, 10947036 + ... + 10947061.

It is an arithmetic number, because the mean of its divisors is an integer number (76629343).

Almost surely, 2^284623261 is an apocalyptic number.

It is an amenable number.

284623261 is a deficient number, since it is larger than the sum of its proper divisors (21894111).

284623261 is a wasteful number, since it uses less digits than its factorization.

284623261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21894110.

The product of its digits is 27648, while the sum is 34.

The square root of 284623261 is about 16870.7812800712. The cubic root of 284623261 is about 657.7943366451.

The spelling of 284623261 in words is "two hundred eighty-four million, six hundred twenty-three thousand, two hundred sixty-one".