240247531 has 2 divisors, whose sum is σ = 240247532. Its totient is φ = 240247530.

The previous prime is 240247529. The next prime is 240247537. The reversal of 240247531 is 135742042.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 240247531 - 2¹ = 240247529 is a prime.

It is a super-2 number, since 2×240247531² = 115437752303191922, which contains 22 as substring.

Together with 240247529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 240247531.

It is not a weakly prime, because it can be changed into another prime (240247537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120123765 + 120123766.

It is an arithmetic number, because the mean of its divisors is an integer number (120123766).

Almost surely, 2^240247531 is an apocalyptic number.

240247531 is a deficient number, since it is larger than the sum of its proper divisors (1).

240247531 is an equidigital number, since it uses as much as digits as its factorization.

240247531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 240247531 is about 15499.9203546341. The cubic root of 240247531 is about 621.6600767733.

Adding to 240247531 its reverse (135742042), we get a palindrome (375989573).

The spelling of 240247531 in words is "two hundred forty million, two hundred forty-seven thousand, five hundred thirty-one".