785205961 has 2 divisors, whose sum is σ = 785205962. Its totient is φ = 785205960.

The previous prime is 785205937. The next prime is 785205991. The reversal of 785205961 is 169502587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544335561 + 240870400 = 23331^2 + 15520^2 .

It is a cyclic number.

It is not a de Polignac number, because 785205961 - 2¹³ = 785197769 is a prime.

It is not a weakly prime, because it can be changed into another prime (785205991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392602980 + 392602981.

It is an arithmetic number, because the mean of its divisors is an integer number (392602981).

Almost surely, 2^785205961 is an apocalyptic number.

It is an amenable number.

785205961 is a deficient number, since it is larger than the sum of its proper divisors (1).

785205961 is an equidigital number, since it uses as much as digits as its factorization.

785205961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 785205961 is about 28021.5267428454. The cubic root of 785205961 is about 922.5598058577.

The spelling of 785205961 in words is "seven hundred eighty-five million, two hundred five thousand, nine hundred sixty-one".