1242161351 has 4 divisors (see below), whose sum is σ = 1282231104. Its totient is φ = 1202091600.

The previous prime is 1242161329. The next prime is 1242161353. The reversal of 1242161351 is 1531612421.

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 1242161351 - 2¹⁸ = 1241899207 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 1242161351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242161353) 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, 20034830 + ... + 20034891.

It is an arithmetic number, because the mean of its divisors is an integer number (320557776).

Almost surely, 2^1242161351 is an apocalyptic number.

1242161351 is a deficient number, since it is larger than the sum of its proper divisors (40069753).

1242161351 is an equidigital number, since it uses as much as digits as its factorization.

1242161351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40069752.

The product of its digits is 1440, while the sum is 26.

The square root of 1242161351 is about 35244.3094839436. The cubic root of 1242161351 is about 1074.9609074661.

Adding to 1242161351 its reverse (1531612421), we get a palindrome (2773773772).

The spelling of 1242161351 in words is "one billion, two hundred forty-two million, one hundred sixty-one thousand, three hundred fifty-one".