1428293493991 has 32 divisors (see below), whose sum is σ = 1856959946240. Its totient is φ = 1066817153664.

The previous prime is 1428293493923. The next prime is 1428293494007. The reversal of 1428293493991 is 1993943928241.

It is a cyclic number.

It is not a de Polignac number, because 1428293493991 - 2⁹ = 1428293493479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428293493091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 970200 + ... + 1948813.

It is an arithmetic number, because the mean of its divisors is an integer number (58029998320).

Almost surely, 2^{1428293493991} is an apocalyptic number.

1428293493991 is a deficient number, since it is larger than the sum of its proper divisors (428666452249).

1428293493991 is a wasteful number, since it uses less digits than its factorization.

1428293493991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919335.

The product of its digits is 30233088, while the sum is 64.

The spelling of 1428293493991 in words is "one trillion, four hundred twenty-eight billion, two hundred ninety-three million, four hundred ninety-three thousand, nine hundred ninety-one".