261158330 has 32 divisors (see below), whose sum is σ = 491474304. Its totient is φ = 99727936.

The previous prime is 261158329. The next prime is 261158333. The reversal of 261158330 is 33851162.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261158293 and 261158302.

It is not an unprimeable number, because it can be changed into a prime (261158333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189524 + ... + 190896.

It is an arithmetic number, because the mean of its divisors is an integer number (15358572).

Almost surely, 2^261158330 is an apocalyptic number.

261158330 is a deficient number, since it is larger than the sum of its proper divisors (230315974).

261158330 is a wasteful number, since it uses less digits than its factorization.

261158330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 261158330 is about 16160.3938689625. The cubic root of 261158330 is about 639.1968522372.

The spelling of 261158330 in words is "two hundred sixty-one million, one hundred fifty-eight thousand, three hundred thirty".