1071391381 has 2 divisors, whose sum is σ = 1071391382. Its totient is φ = 1071391380.

The previous prime is 1071391333. The next prime is 1071391421. The reversal of 1071391381 is 1831931701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863772100 + 207619281 = 29390^2 + 14409^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071391381 - 2¹⁹ = 1070867093 is a prime.

It is a super-2 number, since 2×1071391381² = 2295758982562174322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1071391331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535695690 + 535695691.

It is an arithmetic number, because the mean of its divisors is an integer number (535695691).

Almost surely, 2^1071391381 is an apocalyptic number.

It is an amenable number.

1071391381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071391381 is an equidigital number, since it uses as much as digits as its factorization.

1071391381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1071391381 is about 32732.1154372888. The cubic root of 1071391381 is about 1023.2522684273.

The spelling of 1071391381 in words is "one billion, seventy-one million, three hundred ninety-one thousand, three hundred eighty-one".