140975921 has 4 divisors (see below), whose sum is σ = 142907172. Its totient is φ = 139044672.

The previous prime is 140975899. The next prime is 140975963. The reversal of 140975921 is 129579041.

140975921 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 69488896 + 71487025 = 8336^2 + 8455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140975921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140975971) 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, 965516 + ... + 965661.

It is an arithmetic number, because the mean of its divisors is an integer number (35726793).

Almost surely, 2^140975921 is an apocalyptic number.

It is an amenable number.

140975921 is a deficient number, since it is larger than the sum of its proper divisors (1931251).

140975921 is an equidigital number, since it uses as much as digits as its factorization.

140975921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931250.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 140975921 is about 11873.3281349418. The cubic root of 140975921 is about 520.4531565085.

The spelling of 140975921 in words is "one hundred forty million, nine hundred seventy-five thousand, nine hundred twenty-one".