1242401543401 has 4 divisors (see below), whose sum is σ = 1245732379012. Its totient is φ = 1239070707792.

The previous prime is 1242401543389. The next prime is 1242401543417. The reversal of 1242401543401 is 1043451042421.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 359034648025 + 883366895376 = 599195^2 + 939876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242401543401 - 2¹³ = 1242401535209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242401573401) 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, 1665417246 + ... + 1665417991.

It is an arithmetic number, because the mean of its divisors is an integer number (311433094753).

Almost surely, 2^{1242401543401} is an apocalyptic number.

It is an amenable number.

1242401543401 is a deficient number, since it is larger than the sum of its proper divisors (3330835611).

1242401543401 is an equidigital number, since it uses as much as digits as its factorization.

1242401543401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330835610.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 1242401543401 its reverse (1043451042421), we get a palindrome (2285852585822).

The spelling of 1242401543401 in words is "one trillion, two hundred forty-two billion, four hundred one million, five hundred forty-three thousand, four hundred one".