1004155423391 has 2 divisors, whose sum is σ = 1004155423392. Its totient is φ = 1004155423390.

The previous prime is 1004155423387. The next prime is 1004155423471. The reversal of 1004155423391 is 1933245514001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1004155423391 - 2² = 1004155423387 is a prime.

It is a super-2 number, since 2×1004155423391² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1004155423321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502077711695 + 502077711696.

It is an arithmetic number, because the mean of its divisors is an integer number (502077711696).

Almost surely, 2^{1004155423391} is an apocalyptic number.

1004155423391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004155423391 is an equidigital number, since it uses as much as digits as its factorization.

1004155423391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 1004155423391 in words is "one trillion, four billion, one hundred fifty-five million, four hundred twenty-three thousand, three hundred ninety-one".