240131621 has 4 divisors (see below), whose sum is σ = 240889452. Its totient is φ = 239373792.

The previous prime is 240131609. The next prime is 240131623. The reversal of 240131621 is 126131042.

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 24453025 + 215678596 = 4945^2 + 14686^2 .

It is a cyclic number.

It is not a de Polignac number, because 240131621 - 2¹⁸ = 239869477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 240131593 and 240131602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240131623) 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, 378440 + ... + 379073.

It is an arithmetic number, because the mean of its divisors is an integer number (60222363).

Almost surely, 2^240131621 is an apocalyptic number.

It is an amenable number.

240131621 is a deficient number, since it is larger than the sum of its proper divisors (757831).

240131621 is an equidigital number, since it uses as much as digits as its factorization.

240131621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757830.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 240131621 is about 15496.1808520680. The cubic root of 240131621 is about 621.5600851654.

Adding to 240131621 its reverse (126131042), we get a palindrome (366262663).

The spelling of 240131621 in words is "two hundred forty million, one hundred thirty-one thousand, six hundred twenty-one".