1242022451 has 4 divisors (see below), whose sum is σ = 1242121992. Its totient is φ = 1241922912.

The previous prime is 1242022433. The next prime is 1242022493. The reversal of 1242022451 is 1542202421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1242022451 - 2⁶ = 1242022387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242025451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27830 + ... + 57083.

It is an arithmetic number, because the mean of its divisors is an integer number (310530498).

Almost surely, 2^1242022451 is an apocalyptic number.

1242022451 is a deficient number, since it is larger than the sum of its proper divisors (99541).

1242022451 is an equidigital number, since it uses as much as digits as its factorization.

1242022451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99540.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1242022451 is about 35242.3388979789. The cubic root of 1242022451 is about 1074.9208381585.

Adding to 1242022451 its reverse (1542202421), we get a palindrome (2784224872).

The spelling of 1242022451 in words is "one billion, two hundred forty-two million, twenty-two thousand, four hundred fifty-one".