261622807 has 2 divisors, whose sum is σ = 261622808. Its totient is φ = 261622806.

The previous prime is 261622783. The next prime is 261622831. The reversal of 261622807 is 708226162.

It is a balanced prime because it is at equal distance from previous prime (261622783) and next prime (261622831).

It is a cyclic number.

It is not a de Polignac number, because 261622807 - 2⁷ = 261622679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261622847) 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, 130811403 + 130811404.

It is an arithmetic number, because the mean of its divisors is an integer number (130811404).

Almost surely, 2^261622807 is an apocalyptic number.

261622807 is a deficient number, since it is larger than the sum of its proper divisors (1).

261622807 is an equidigital number, since it uses as much as digits as its factorization.

261622807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 261622807 is about 16174.7583289519. The cubic root of 261622807 is about 639.5755706438.

Adding to 261622807 its reverse (708226162), we get a palindrome (969848969).

The spelling of 261622807 in words is "two hundred sixty-one million, six hundred twenty-two thousand, eight hundred seven".