1242120431 has 16 divisors (see below), whose sum is σ = 1329020160. Its totient is φ = 1158312960.

The previous prime is 1242120427. The next prime is 1242120433. The reversal of 1242120431 is 1340212421.

It is a cyclic number.

It is not a de Polignac number, because 1242120431 - 2² = 1242120427 is a prime.

It is a super-2 number, since 2×1242120431² = 3085726330215251522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242120433) 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 15 ways as a sum of consecutive naturals, for example, 604001 + ... + 606053.

It is an arithmetic number, because the mean of its divisors is an integer number (83063760).

Almost surely, 2^1242120431 is an apocalyptic number.

1242120431 is a deficient number, since it is larger than the sum of its proper divisors (86899729).

1242120431 is a wasteful number, since it uses less digits than its factorization.

1242120431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1242120431 is about 35243.7289599157. The cubic root of 1242120431 is about 1074.9491033412.

Adding to 1242120431 its reverse (1340212421), we get a palindrome (2582332852).

The spelling of 1242120431 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, four hundred thirty-one".