405522261 has 8 divisors (see below), whose sum is σ = 600773760. Its totient is φ = 270348156.

The previous prime is 405522241. The next prime is 405522289. The reversal of 405522261 is 162225504.

It is not a de Polignac number, because 405522261 - 2⁶ = 405522197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 15019343 = 405522261 / (4 + 0 + 5 + 5 + 2 + 2 + 2 + 6 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405522241) 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, 7509645 + ... + 7509698.

It is an arithmetic number, because the mean of its divisors is an integer number (75096720).

Almost surely, 2^405522261 is an apocalyptic number.

It is an amenable number.

405522261 is a deficient number, since it is larger than the sum of its proper divisors (195251499).

405522261 is a wasteful number, since it uses less digits than its factorization.

405522261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15019352 (or 15019346 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 405522261 is about 20137.5832959171. The cubic root of 405522261 is about 740.1815119629.

Adding to 405522261 its reverse (162225504), we get a palindrome (567747765).

The spelling of 405522261 in words is "four hundred five million, five hundred twenty-two thousand, two hundred sixty-one".