766439131 has 2 divisors, whose sum is σ = 766439132. Its totient is φ = 766439130.

The previous prime is 766439129. The next prime is 766439159. The reversal of 766439131 is 131934667.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 766439131 - 2¹ = 766439129 is a prime.

It is a super-2 number, since 2×766439131² = 1174857883056070322, which contains 22 as substring.

Together with 766439129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (766439161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383219565 + 383219566.

It is an arithmetic number, because the mean of its divisors is an integer number (383219566).

Almost surely, 2^766439131 is an apocalyptic number.

766439131 is a deficient number, since it is larger than the sum of its proper divisors (1).

766439131 is an equidigital number, since it uses as much as digits as its factorization.

766439131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 766439131 is about 27684.6370935217. The cubic root of 766439131 is about 915.1505743220.

The spelling of 766439131 in words is "seven hundred sixty-six million, four hundred thirty-nine thousand, one hundred thirty-one".