1928430393121 has 2 divisors, whose sum is σ = 1928430393122. Its totient is φ = 1928430393120.

The previous prime is 1928430393119. The next prime is 1928430393137. The reversal of 1928430393121 is 1213930348291.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1655110553121 + 273319840000 = 1286511^2 + 522800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1928430393121 - 2¹ = 1928430393119 is a prime.

It is a super-2 number, since 2×1928430393121² (a number of 25 digits) contains 22 as substring.

Together with 1928430393119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1928430393821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964215196560 + 964215196561.

It is an arithmetic number, because the mean of its divisors is an integer number (964215196561).

Almost surely, 2^{1928430393121} is an apocalyptic number.

It is an amenable number.

1928430393121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928430393121 is an equidigital number, since it uses as much as digits as its factorization.

1928430393121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 1928430393121 in words is "one trillion, nine hundred twenty-eight billion, four hundred thirty million, three hundred ninety-three thousand, one hundred twenty-one".