9785781541 has 2 divisors, whose sum is σ = 9785781542. Its totient is φ = 9785781540.

The previous prime is 9785781521. The next prime is 9785781653. The reversal of 9785781541 is 1451875879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7696377441 + 2089404100 = 87729^2 + 45710^2 .

It is an emirp because it is prime and its reverse (1451875879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9785781541 - 2²¹ = 9783684389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9785781521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4892890770 + 4892890771.

It is an arithmetic number, because the mean of its divisors is an integer number (4892890771).

Almost surely, 2^9785781541 is an apocalyptic number.

It is an amenable number.

9785781541 is a deficient number, since it is larger than the sum of its proper divisors (1).

9785781541 is an equidigital number, since it uses as much as digits as its factorization.

9785781541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 55.

The square root of 9785781541 is about 98923.1092364165. The cubic root of 9785781541 is about 2138.9395232619.

The spelling of 9785781541 in words is "nine billion, seven hundred eighty-five million, seven hundred eighty-one thousand, five hundred forty-one".