261722627 has 2 divisors, whose sum is σ = 261722628. Its totient is φ = 261722626.

The previous prime is 261722621. The next prime is 261722653. The reversal of 261722627 is 726227162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261722627 - 2⁸ = 261722371 is a prime.

It is a super-2 number, since 2×261722627² = 136997466967562258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261722621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130861313 + 130861314.

It is an arithmetic number, because the mean of its divisors is an integer number (130861314).

Almost surely, 2^261722627 is an apocalyptic number.

261722627 is a deficient number, since it is larger than the sum of its proper divisors (1).

261722627 is an equidigital number, since it uses as much as digits as its factorization.

261722627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 261722627 is about 16177.8437067491. The cubic root of 261722627 is about 639.6569018759.

Adding to 261722627 its reverse (726227162), we get a palindrome (987949789).

The spelling of 261722627 in words is "two hundred sixty-one million, seven hundred twenty-two thousand, six hundred twenty-seven".