140153521 has 4 divisors (see below), whose sum is σ = 143941492. Its totient is φ = 136365552.

The previous prime is 140153509. The next prime is 140153537. The reversal of 140153521 is 125351041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125351041 = 269 ⋅465989.

It can be written as a sum of positive squares in 2 ways, for example, as 88830625 + 51322896 = 9425^2 + 7164^2 .

It is a cyclic number.

It is not a de Polignac number, because 140153521 - 2⁷ = 140153393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140153492 and 140153501.

It is not an unprimeable number, because it can be changed into a prime (140153501) 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, 1893930 + ... + 1894003.

It is an arithmetic number, because the mean of its divisors is an integer number (35985373).

Almost surely, 2^140153521 is an apocalyptic number.

It is an amenable number.

140153521 is a deficient number, since it is larger than the sum of its proper divisors (3787971).

140153521 is an equidigital number, since it uses as much as digits as its factorization.

140153521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3787970.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 140153521 is about 11838.6452349921. The cubic root of 140153521 is about 519.4391401096.

The spelling of 140153521 in words is "one hundred forty million, one hundred fifty-three thousand, five hundred twenty-one".