240491521 has 4 divisors (see below), whose sum is σ = 248249344. Its totient is φ = 232733700.

The previous prime is 240491497. The next prime is 240491539. The reversal of 240491521 is 125194042.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125194042 = 2 ⋅62597021.

It is a cyclic number.

It is not a de Polignac number, because 240491521 - 2⁷ = 240491393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 240491521.

It is not an unprimeable number, because it can be changed into a prime (240491551) 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, 3878865 + ... + 3878926.

It is an arithmetic number, because the mean of its divisors is an integer number (62062336).

Almost surely, 2^240491521 is an apocalyptic number.

It is an amenable number.

240491521 is a deficient number, since it is larger than the sum of its proper divisors (7757823).

240491521 is an equidigital number, since it uses as much as digits as its factorization.

240491521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7757822.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 240491521 is about 15507.7890429294. The cubic root of 240491521 is about 621.8704535782.

The spelling of 240491521 in words is "two hundred forty million, four hundred ninety-one thousand, five hundred twenty-one".