787000661 has 2 divisors, whose sum is σ = 787000662. Its totient is φ = 787000660.

The previous prime is 787000639. The next prime is 787000679. The reversal of 787000661 is 166000787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755920036 + 31080625 = 27494^2 + 5575^2 .

It is a cyclic number.

It is not a de Polignac number, because 787000661 - 2⁶ = 787000597 is a prime.

It is a super-3 number, since 3×787000661³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (787000631) 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, 393500330 + 393500331.

It is an arithmetic number, because the mean of its divisors is an integer number (393500331).

Almost surely, 2^787000661 is an apocalyptic number.

It is an amenable number.

787000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

787000661 is an equidigital number, since it uses as much as digits as its factorization.

787000661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 787000661 is about 28053.5320592613. The cubic root of 787000661 is about 923.2621516138.

The spelling of 787000661 in words is "seven hundred eighty-seven million, six hundred sixty-one", and thus it is an aban number.