781143133 has 2 divisors, whose sum is σ = 781143134. Its totient is φ = 781143132.

The previous prime is 781143131. The next prime is 781143161. The reversal of 781143133 is 331341187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492041124 + 289102009 = 22182^2 + 17003^2 .

It is a cyclic number.

It is not a de Polignac number, because 781143133 - 2¹ = 781143131 is a prime.

It is a super-2 number, since 2×781143133² = 1220369188466111378, which contains 22 as substring.

Together with 781143131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 781143095 and 781143104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781143131) 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, 390571566 + 390571567.

It is an arithmetic number, because the mean of its divisors is an integer number (390571567).

Almost surely, 2^781143133 is an apocalyptic number.

It is an amenable number.

781143133 is a deficient number, since it is larger than the sum of its proper divisors (1).

781143133 is an equidigital number, since it uses as much as digits as its factorization.

781143133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 781143133 is about 27948.9379583554. The cubic root of 781143133 is about 920.9658779298.

The spelling of 781143133 in words is "seven hundred eighty-one million, one hundred forty-three thousand, one hundred thirty-three".