1002154344491 has 2 divisors, whose sum is σ = 1002154344492. Its totient is φ = 1002154344490.

The previous prime is 1002154344419. The next prime is 1002154344497. The reversal of 1002154344491 is 1944434512001.

Together with previous prime (1002154344419) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (1944434512001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1002154344491 - 2¹⁰ = 1002154343467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1002154344497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501077172245 + 501077172246.

It is an arithmetic number, because the mean of its divisors is an integer number (501077172246).

Almost surely, 2^{1002154344491} is an apocalyptic number.

1002154344491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002154344491 is an equidigital number, since it uses as much as digits as its factorization.

1002154344491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 1002154344491 its reverse (1944434512001), we get a palindrome (2946588856492).

The spelling of 1002154344491 in words is "one trillion, two billion, one hundred fifty-four million, three hundred forty-four thousand, four hundred ninety-one".