261223461 has 10 divisors (see below), whose sum is σ = 390222822. Its totient is φ = 174148920.

The previous prime is 261223451. The next prime is 261223477. The reversal of 261223461 is 164322162.

261223461 is a `hidden beast` number, since 2 + 612 + 2 + 3 + 46 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 216266436 + 44957025 = 14706^2 + 6705^2 .

It is not a de Polignac number, because 261223461 - 2⁵ = 261223429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261223451) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1612410 + ... + 1612571.

Almost surely, 2^261223461 is an apocalyptic number.

It is an amenable number.

261223461 is a deficient number, since it is larger than the sum of its proper divisors (128999361).

261223461 is an equidigital number, since it uses as much as digits as its factorization.

261223461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3224993 (or 3224984 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 261223461 is about 16162.4088860541. The cubic root of 261223461 is about 639.2499848456.

The spelling of 261223461 in words is "two hundred sixty-one million, two hundred twenty-three thousand, four hundred sixty-one".