261147506 has 8 divisors (see below), whose sum is σ = 414763740. Its totient is φ = 122892928.

The previous prime is 261147493. The next prime is 261147521. The reversal of 261147506 is 605741162.

It can be written as a sum of positive squares in 2 ways, for example, as 261113281 + 34225 = 16159^2 + 185^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3840371 + ... + 3840438.

Almost surely, 2^261147506 is an apocalyptic number.

261147506 is a deficient number, since it is larger than the sum of its proper divisors (153616234).

261147506 is a wasteful number, since it uses less digits than its factorization.

261147506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7680828.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 261147506 is about 16160.0589726647. The cubic root of 261147506 is about 639.1880213717.

Adding to 261147506 its reverse (605741162), we get a palindrome (866888668).

The spelling of 261147506 in words is "two hundred sixty-one million, one hundred forty-seven thousand, five hundred six".