261009167 has 2 divisors, whose sum is σ = 261009168. Its totient is φ = 261009166.

The previous prime is 261009131. The next prime is 261009173. The reversal of 261009167 is 761900162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261009167 - 2²² = 256814863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261009197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130504583 + 130504584.

It is an arithmetic number, because the mean of its divisors is an integer number (130504584).

Almost surely, 2^261009167 is an apocalyptic number.

261009167 is a deficient number, since it is larger than the sum of its proper divisors (1).

261009167 is an equidigital number, since it uses as much as digits as its factorization.

261009167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 261009167 is about 16155.7781304399. The cubic root of 261009167 is about 639.0751346593.

The spelling of 261009167 in words is "two hundred sixty-one million, nine thousand, one hundred sixty-seven".