1075123478381 has 2 divisors, whose sum is σ = 1075123478382. Its totient is φ = 1075123478380.

The previous prime is 1075123478347. The next prime is 1075123478423. The reversal of 1075123478381 is 1838743215701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1014671421481 + 60452056900 = 1007309^2 + 245870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1075123478381 - 2³⁴ = 1057943609197 is a prime.

It is a super-2 number, since 2×1075123478381² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1075123471381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537561739190 + 537561739191.

It is an arithmetic number, because the mean of its divisors is an integer number (537561739191).

Almost surely, 2^{1075123478381} is an apocalyptic number.

It is an amenable number.

1075123478381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1075123478381 is an equidigital number, since it uses as much as digits as its factorization.

1075123478381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 1075123478381 in words is "one trillion, seventy-five billion, one hundred twenty-three million, four hundred seventy-eight thousand, three hundred eighty-one".