1031740781 has 2 divisors, whose sum is σ = 1031740782. Its totient is φ = 1031740780.

The previous prime is 1031740691. The next prime is 1031740783. The reversal of 1031740781 is 1870471301.

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., 570779881 + 460960900 = 23891^2 + 21470^2 .

It is an emirp because it is prime and its reverse (1870471301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1031740781 - 2²⁶ = 964631917 is a prime.

It is a super-2 number, since 2×1031740781² = 2128978078356979922, which contains 22 as substring.

Together with 1031740783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031740783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515870390 + 515870391.

It is an arithmetic number, because the mean of its divisors is an integer number (515870391).

Almost surely, 2^1031740781 is an apocalyptic number.

It is an amenable number.

1031740781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031740781 is an equidigital number, since it uses as much as digits as its factorization.

1031740781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 1031740781 is about 32120.7219875270. The cubic root of 1031740781 is about 1010.4702515611.

The spelling of 1031740781 in words is "one billion, thirty-one million, seven hundred forty thousand, seven hundred eighty-one".