261223061 has 8 divisors (see below), whose sum is σ = 290348064. Its totient is φ = 232994320.

The previous prime is 261223051. The next prime is 261223063. The reversal of 261223061 is 160322162.

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

It is a cyclic number.

It is not a de Polignac number, because 261223061 - 2¹⁰ = 261222037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261223063) 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, 223451 + ... + 224616.

It is an arithmetic number, because the mean of its divisors is an integer number (36293508).

Almost surely, 2^261223061 is an apocalyptic number.

It is an amenable number.

261223061 is a deficient number, since it is larger than the sum of its proper divisors (29125003).

261223061 is a wasteful number, since it uses less digits than its factorization.

261223061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448131.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 261223061 is about 16162.3965116563. The cubic root of 261223061 is about 639.2496585603.

It can be divided in two parts, 261 and 223061, that added together give a palindrome (223322).

The spelling of 261223061 in words is "two hundred sixty-one million, two hundred twenty-three thousand, sixty-one".