261622567 has 2 divisors, whose sum is σ = 261622568. Its totient is φ = 261622566.

The previous prime is 261622561. The next prime is 261622591. The reversal of 261622567 is 765226162.

261622567 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261622567 is a prime.

It is equal to p_14279707 and since 261622567 and 14279707 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261622561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130811283 + 130811284.

It is an arithmetic number, because the mean of its divisors is an integer number (130811284).

Almost surely, 2^261622567 is an apocalyptic number.

261622567 is a deficient number, since it is larger than the sum of its proper divisors (1).

261622567 is an equidigital number, since it uses as much as digits as its factorization.

261622567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 261622567 is about 16174.7509099831. The cubic root of 261622567 is about 639.5753750719.

The spelling of 261622567 in words is "two hundred sixty-one million, six hundred twenty-two thousand, five hundred sixty-seven".