1001401555123 has 2 divisors, whose sum is σ = 1001401555124. Its totient is φ = 1001401555122.

The previous prime is 1001401555117. The next prime is 1001401555151. The reversal of 1001401555123 is 3215551041001.

It is an a-pointer prime, because the next prime (1001401555151) can be obtained adding 1001401555123 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001401555123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001401555091 and 1001401555100.

It is not a weakly prime, because it can be changed into another prime (1001401555723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500700777561 + 500700777562.

It is an arithmetic number, because the mean of its divisors is an integer number (500700777562).

Almost surely, 2^{1001401555123} is an apocalyptic number.

1001401555123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001401555123 is an equidigital number, since it uses as much as digits as its factorization.

1001401555123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 1001401555123 its reverse (3215551041001), we get a palindrome (4216952596124).

The spelling of 1001401555123 in words is "one trillion, one billion, four hundred one million, five hundred fifty-five thousand, one hundred twenty-three".