167740561 has 2 divisors, whose sum is σ = 167740562. Its totient is φ = 167740560.

The previous prime is 167740537. The next prime is 167740567. The reversal of 167740561 is 165047761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164968336 + 2772225 = 12844^2 + 1665^2 .

It is a cyclic number.

It is not a de Polignac number, because 167740561 - 2²¹ = 165643409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 167740561.

It is not a weakly prime, because it can be changed into another prime (167740567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83870280 + 83870281.

It is an arithmetic number, because the mean of its divisors is an integer number (83870281).

Almost surely, 2^167740561 is an apocalyptic number.

It is an amenable number.

167740561 is a deficient number, since it is larger than the sum of its proper divisors (1).

167740561 is an equidigital number, since it uses as much as digits as its factorization.

167740561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 167740561 is about 12951.4694533091. The cubic root of 167740561 is about 551.5006522219.

The spelling of 167740561 in words is "one hundred sixty-seven million, seven hundred forty thousand, five hundred sixty-one".