167561111 has 2 divisors, whose sum is σ = 167561112. Its totient is φ = 167561110.

The previous prime is 167561099. The next prime is 167561113. The reversal of 167561111 is 111165761.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-167561111 is a prime.

Together with 167561113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167561113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83780555 + 83780556.

It is an arithmetic number, because the mean of its divisors is an integer number (83780556).

Almost surely, 2^167561111 is an apocalyptic number.

167561111 is a deficient number, since it is larger than the sum of its proper divisors (1).

167561111 is an equidigital number, since it uses as much as digits as its factorization.

167561111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 29.

The square root of 167561111 is about 12944.5398141456. The cubic root of 167561111 is about 551.3039156580.

The spelling of 167561111 in words is "one hundred sixty-seven million, five hundred sixty-one thousand, one hundred eleven".