1242020231 has 4 divisors (see below), whose sum is σ = 1244889072. Its totient is φ = 1239151392.

The previous prime is 1242020203. The next prime is 1242020233. The reversal of 1242020231 is 1320202421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242020231 is a prime.

It is a super-2 number, since 2×1242020231² = 3085228508426586722, 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 (1242020233) 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, 1433771 + ... + 1434636.

It is an arithmetic number, because the mean of its divisors is an integer number (311222268).

Almost surely, 2^1242020231 is an apocalyptic number.

1242020231 is a deficient number, since it is larger than the sum of its proper divisors (2868841).

1242020231 is an equidigital number, since it uses as much as digits as its factorization.

1242020231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868840.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1242020231 is about 35242.3074017579. The cubic root of 1242020231 is about 1074.9201977177.

Adding to 1242020231 its reverse (1320202421), we get a palindrome (2562222652).

The spelling of 1242020231 in words is "one billion, two hundred forty-two million, twenty thousand, two hundred thirty-one".