261622359 has 8 divisors (see below), whose sum is σ = 387588720. Its totient is φ = 174414888.

The previous prime is 261622357. The next prime is 261622373. The reversal of 261622359 is 953226162.

261622359 is a `hidden beast` number, since 2 + 616 + 2 + 2 + 35 + 9 = 666.

261622359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261622359 - 2¹ = 261622357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261622357) 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, 4844832 + ... + 4844885.

It is an arithmetic number, because the mean of its divisors is an integer number (48448590).

Almost surely, 2^261622359 is an apocalyptic number.

261622359 is a deficient number, since it is larger than the sum of its proper divisors (125966361).

261622359 is an equidigital number, since it uses as much as digits as its factorization.

261622359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9689726 (or 9689720 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 261622359 is about 16174.7444802074. The cubic root of 261622359 is about 639.5752055762.

The spelling of 261622359 in words is "two hundred sixty-one million, six hundred twenty-two thousand, three hundred fifty-nine".