140164561 has 2 divisors, whose sum is σ = 140164562. Its totient is φ = 140164560.

The previous prime is 140164537. The next prime is 140164573. The reversal of 140164561 is 165461041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99600400 + 40564161 = 9980^2 + 6369^2 .

It is a cyclic number.

It is not a de Polignac number, because 140164561 - 2⁵ = 140164529 is a prime.

It is a super-2 number, since 2×140164561² = 39292208320645442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (140164061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70082280 + 70082281.

It is an arithmetic number, because the mean of its divisors is an integer number (70082281).

Almost surely, 2^140164561 is an apocalyptic number.

It is an amenable number.

140164561 is a deficient number, since it is larger than the sum of its proper divisors (1).

140164561 is an equidigital number, since it uses as much as digits as its factorization.

140164561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 140164561 is about 11839.1114953784. Note that the first 3 decimals coincide. The cubic root of 140164561 is about 519.4527786242.

The spelling of 140164561 in words is "one hundred forty million, one hundred sixty-four thousand, five hundred sixty-one".