787159661 has 2 divisors, whose sum is σ = 787159662. Its totient is φ = 787159660.

The previous prime is 787159649. The next prime is 787159669. The reversal of 787159661 is 166951787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 695957161 + 91202500 = 26381^2 + 9550^2 .

It is a cyclic number.

It is not a de Polignac number, because 787159661 - 2¹⁴ = 787143277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (787159669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393579830 + 393579831.

It is an arithmetic number, because the mean of its divisors is an integer number (393579831).

Almost surely, 2^787159661 is an apocalyptic number.

It is an amenable number.

787159661 is a deficient number, since it is larger than the sum of its proper divisors (1).

787159661 is an equidigital number, since it uses as much as digits as its factorization.

787159661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 50.

The square root of 787159661 is about 28056.3657839001. The cubic root of 787159661 is about 923.3243238603.

The spelling of 787159661 in words is "seven hundred eighty-seven million, one hundred fifty-nine thousand, six hundred sixty-one".