1000766381 has 2 divisors, whose sum is σ = 1000766382. Its totient is φ = 1000766380.

The previous prime is 1000766359. The next prime is 1000766383. The reversal of 1000766381 is 1836670001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 941937481 + 58828900 = 30691^2 + 7670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000766381 - 2¹⁰ = 1000765357 is a prime.

It is a super-2 number, since 2×1000766381² = 2003066698679674322, which contains 22 as substring.

Together with 1000766383, 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 (1000766383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500383190 + 500383191.

It is an arithmetic number, because the mean of its divisors is an integer number (500383191).

Almost surely, 2^1000766381 is an apocalyptic number.

It is an amenable number.

1000766381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000766381 is an equidigital number, since it uses as much as digits as its factorization.

1000766381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1000766381 is about 31634.8918284858. The cubic root of 1000766381 is about 1000.2553951011.

The spelling of 1000766381 in words is "one billion, seven hundred sixty-six thousand, three hundred eighty-one".