140655521 has 4 divisors (see below), whose sum is σ = 140736192. Its totient is φ = 140574852.

The previous prime is 140655503. The next prime is 140655523. The reversal of 140655521 is 125556041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 140655521 - 2⁶ = 140655457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140655523) 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, 37661 + ... + 41226.

It is an arithmetic number, because the mean of its divisors is an integer number (35184048).

Almost surely, 2^140655521 is an apocalyptic number.

It is an amenable number.

140655521 is a deficient number, since it is larger than the sum of its proper divisors (80671).

140655521 is an equidigital number, since it uses as much as digits as its factorization.

140655521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80670.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 140655521 is about 11859.8280341664. The cubic root of 140655521 is about 520.0585745161.

The spelling of 140655521 in words is "one hundred forty million, six hundred fifty-five thousand, five hundred twenty-one".