385308661 has 2 divisors, whose sum is σ = 385308662. Its totient is φ = 385308660.

The previous prime is 385308653. The next prime is 385308709. The reversal of 385308661 is 166803583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288660100 + 96648561 = 16990^2 + 9831^2 .

It is a cyclic number.

It is not a de Polignac number, because 385308661 - 2³ = 385308653 is a prime.

It is a super-2 number, since 2×385308661² = 296925528483225842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385300661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192654330 + 192654331.

It is an arithmetic number, because the mean of its divisors is an integer number (192654331).

Almost surely, 2^385308661 is an apocalyptic number.

It is an amenable number.

385308661 is a deficient number, since it is larger than the sum of its proper divisors (1).

385308661 is an equidigital number, since it uses as much as digits as its factorization.

385308661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 385308661 is about 19629.2807051099. The cubic root of 385308661 is about 727.6729935827.

The spelling of 385308661 in words is "three hundred eighty-five million, three hundred eight thousand, six hundred sixty-one".