261992167 has 2 divisors, whose sum is σ = 261992168. Its totient is φ = 261992166.

The previous prime is 261992141. The next prime is 261992179. The reversal of 261992167 is 761299162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261992167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261992567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130996083 + 130996084.

It is an arithmetic number, because the mean of its divisors is an integer number (130996084).

Almost surely, 2^261992167 is an apocalyptic number.

261992167 is a deficient number, since it is larger than the sum of its proper divisors (1).

261992167 is an equidigital number, since it uses as much as digits as its factorization.

261992167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 261992167 is about 16186.1720922521. The cubic root of 261992167 is about 639.8764141250.

The spelling of 261992167 in words is "two hundred sixty-one million, nine hundred ninety-two thousand, one hundred sixty-seven".