1078217386381 has 2 divisors, whose sum is σ = 1078217386382. Its totient is φ = 1078217386380.

The previous prime is 1078217386339. The next prime is 1078217386409. The reversal of 1078217386381 is 1836837128701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1075180274281 + 3037112100 = 1036909^2 + 55110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1078217386381 - 2¹¹ = 1078217384333 is a prime.

It is a super-2 number, since 2×1078217386381² (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 (1078217336381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539108693190 + 539108693191.

It is an arithmetic number, because the mean of its divisors is an integer number (539108693191).

Almost surely, 2^{1078217386381} is an apocalyptic number.

It is an amenable number.

1078217386381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1078217386381 is an equidigital number, since it uses as much as digits as its factorization.

1078217386381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 1078217386381 in words is "one trillion, seventy-eight billion, two hundred seventeen million, three hundred eighty-six thousand, three hundred eighty-one".