261224630 has 16 divisors (see below), whose sum is σ = 472805424. Its totient is φ = 103911840.

The previous prime is 261224629. The next prime is 261224641. The reversal of 261224630 is 36422162.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261224630.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 70352 + ... + 73971.

It is an arithmetic number, because the mean of its divisors is an integer number (29550339).

Almost surely, 2^261224630 is an apocalyptic number.

261224630 is a deficient number, since it is larger than the sum of its proper divisors (211580794).

261224630 is a wasteful number, since it uses less digits than its factorization.

261224630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144511.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 261224630 is about 16162.4450501773. The cubic root of 261224630 is about 639.2509384125.

Adding to 261224630 its reverse (36422162), we get a palindrome (297646792).

The spelling of 261224630 in words is "two hundred sixty-one million, two hundred twenty-four thousand, six hundred thirty".