1240245451 has 4 divisors (see below), whose sum is σ = 1245661600. Its totient is φ = 1234829304.

The previous prime is 1240245443. The next prime is 1240245469. The reversal of 1240245451 is 1545420421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1240245451 - 2³ = 1240245443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240245401) 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, 2707731 + ... + 2708188.

It is an arithmetic number, because the mean of its divisors is an integer number (311415400).

Almost surely, 2^1240245451 is an apocalyptic number.

1240245451 is a deficient number, since it is larger than the sum of its proper divisors (5416149).

1240245451 is an equidigital number, since it uses as much as digits as its factorization.

1240245451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416148.

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 1240245451 is about 35217.1187208721. The cubic root of 1240245451 is about 1074.4079526318.

Adding to 1240245451 its reverse (1545420421), we get a palindrome (2785665872).

The spelling of 1240245451 in words is "one billion, two hundred forty million, two hundred forty-five thousand, four hundred fifty-one".