1242454159 has 4 divisors (see below), whose sum is σ = 1244726104. Its totient is φ = 1240182216.

The previous prime is 1242454153. The next prime is 1242454183. The reversal of 1242454159 is 9514542421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9514542421 = 28813 ⋅330217.

It is a cyclic number.

It is not a de Polignac number, because 1242454159 - 2⁹ = 1242453647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242454153) 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, 1135152 + ... + 1136245.

It is an arithmetic number, because the mean of its divisors is an integer number (311181526).

Almost surely, 2^1242454159 is an apocalyptic number.

1242454159 is a deficient number, since it is larger than the sum of its proper divisors (2271945).

1242454159 is an equidigital number, since it uses as much as digits as its factorization.

1242454159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271944.

The product of its digits is 57600, while the sum is 37.

The square root of 1242454159 is about 35248.4632147275. The cubic root of 1242454159 is about 1075.0453657437.

The spelling of 1242454159 in words is "one billion, two hundred forty-two million, four hundred fifty-four thousand, one hundred fifty-nine".