261226577 has 8 divisors (see below), whose sum is σ = 271857600. Its totient is φ = 250703824.

The previous prime is 261226547. The next prime is 261226579. The reversal of 261226577 is 775622162.

It is a happy number.

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 261226577 - 2⁶ = 261226513 is a prime.

It is a super-2 number, since 2×261226577² = 136478649062273858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261226577.

It is not an unprimeable number, because it can be changed into a prime (261226579) 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, 22127 + ... + 31812.

It is an arithmetic number, because the mean of its divisors is an integer number (33982200).

Almost surely, 2^261226577 is an apocalyptic number.

It is an amenable number.

261226577 is a deficient number, since it is larger than the sum of its proper divisors (10631023).

261226577 is a wasteful number, since it uses less digits than its factorization.

261226577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54135.

The product of its digits is 70560, while the sum is 38.

The square root of 261226577 is about 16162.5052822884. The cubic root of 261226577 is about 639.2525265967.

The spelling of 261226577 in words is "two hundred sixty-one million, two hundred twenty-six thousand, five hundred seventy-seven".