261223010 has 48 divisors (see below), whose sum is σ = 493857000. Its totient is φ = 99466752.

The previous prime is 261223009. The next prime is 261223021. The reversal of 261223010 is 10322162.

It can be written as a sum of positive squares in 12 ways, for example, as 23107249 + 238115761 = 4807^2 + 15431^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261223010.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 748316 + ... + 748664.

Almost surely, 2^261223010 is an apocalyptic number.

261223010 is a deficient number, since it is larger than the sum of its proper divisors (232633990).

261223010 is a wasteful number, since it uses less digits than its factorization.

261223010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 261223010 is about 16162.3949339199. The cubic root of 261223010 is about 639.2496169589.

Adding to 261223010 its reverse (10322162), we get a palindrome (271545172).

The spelling of 261223010 in words is "two hundred sixty-one million, two hundred twenty-three thousand, ten".