140055581 has 2 divisors, whose sum is σ = 140055582. Its totient is φ = 140055580.

The previous prime is 140055577. The next prime is 140055583. The reversal of 140055581 is 185550041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83429956 + 56625625 = 9134^2 + 7525^2 .

It is an emirp because it is prime and its reverse (185550041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140055581 - 2² = 140055577 is a prime.

It is a super-2 number, since 2×140055581² = 39231131538495122, which contains 22 as substring.

Together with 140055583, 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 (140055583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70027790 + 70027791.

It is an arithmetic number, because the mean of its divisors is an integer number (70027791).

Almost surely, 2^140055581 is an apocalyptic number.

It is an amenable number.

140055581 is a deficient number, since it is larger than the sum of its proper divisors (1).

140055581 is an equidigital number, since it uses as much as digits as its factorization.

140055581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 140055581 is about 11834.5080590619. The cubic root of 140055581 is about 519.3181163352.

The spelling of 140055581 in words is "one hundred forty million, fifty-five thousand, five hundred eighty-one".