140821481 has 4 divisors (see below), whose sum is σ = 141635652. Its totient is φ = 140007312.

The previous prime is 140821451. The next prime is 140821487. The reversal of 140821481 is 184128041.

It is a happy number.

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 110670400 + 30151081 = 10520^2 + 5491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140821481 is a prime.

It is a super-2 number, since 2×140821481² = 39661379022066722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140821487) 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 in 3 ways as a sum of consecutive naturals, for example, 406826 + ... + 407171.

It is an arithmetic number, because the mean of its divisors is an integer number (35408913).

Almost surely, 2^140821481 is an apocalyptic number.

It is an amenable number.

140821481 is a deficient number, since it is larger than the sum of its proper divisors (814171).

140821481 is an equidigital number, since it uses as much as digits as its factorization.

140821481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814170.

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 140821481 is about 11866.8227002850. The cubic root of 140821481 is about 520.2630338392.

The spelling of 140821481 in words is "one hundred forty million, eight hundred twenty-one thousand, four hundred eighty-one".