140681591 has 2 divisors, whose sum is σ = 140681592. Its totient is φ = 140681590.

The previous prime is 140681533. The next prime is 140681599. The reversal of 140681591 is 195186041.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 140681591 - 2²² = 136487287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140681599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70340795 + 70340796.

It is an arithmetic number, because the mean of its divisors is an integer number (70340796).

Almost surely, 2^140681591 is an apocalyptic number.

140681591 is a deficient number, since it is larger than the sum of its proper divisors (1).

140681591 is an equidigital number, since it uses as much as digits as its factorization.

140681591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 140681591 is about 11860.9270716922. The cubic root of 140681591 is about 520.0907028663.

The spelling of 140681591 in words is "one hundred forty million, six hundred eighty-one thousand, five hundred ninety-one".