140991905 has 4 divisors (see below), whose sum is σ = 169190292. Its totient is φ = 112793520.

The previous prime is 140991901. The next prime is 140991911. The reversal of 140991905 is 509199041.

140991905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75203584 + 65788321 = 8672^2 + 8111^2 .

It is not a de Polignac number, because 140991905 - 2² = 140991901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140991901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14099186 + ... + 14099195.

It is an arithmetic number, because the mean of its divisors is an integer number (42297573).

Almost surely, 2^140991905 is an apocalyptic number.

It is an amenable number.

140991905 is a deficient number, since it is larger than the sum of its proper divisors (28198387).

140991905 is an equidigital number, since it uses as much as digits as its factorization.

140991905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28198386.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 140991905 is about 11874.0012211554. The cubic root of 140991905 is about 520.4728256094.

The spelling of 140991905 in words is "one hundred forty million, nine hundred ninety-one thousand, nine hundred five".