1031420749781 has 2 divisors, whose sum is σ = 1031420749782. Its totient is φ = 1031420749780.

The previous prime is 1031420749727. The next prime is 1031420749813. The reversal of 1031420749781 is 1879470241301.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 924011175025 + 107409574756 = 961255^2 + 327734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031420749781 - 2⁶ = 1031420749717 is a prime.

It is a super-2 number, since 2×1031420749781² (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 (1031420749081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515710374890 + 515710374891.

It is an arithmetic number, because the mean of its divisors is an integer number (515710374891).

Almost surely, 2^{1031420749781} is an apocalyptic number.

It is an amenable number.

1031420749781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031420749781 is an equidigital number, since it uses as much as digits as its factorization.

1031420749781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 1031420749781 in words is "one trillion, thirty-one billion, four hundred twenty million, seven hundred forty-nine thousand, seven hundred eighty-one".