9855491357 has 2 divisors, whose sum is σ = 9855491358. Its totient is φ = 9855491356.

The previous prime is 9855491353. The next prime is 9855491377. The reversal of 9855491357 is 7531945589.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6919910596 + 2935580761 = 83186^2 + 54181^2 .

It is a cyclic number.

It is not a de Polignac number, because 9855491357 - 2² = 9855491353 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9855491353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927745678 + 4927745679.

It is an arithmetic number, because the mean of its divisors is an integer number (4927745679).

Almost surely, 2^9855491357 is an apocalyptic number.

It is an amenable number.

9855491357 is a deficient number, since it is larger than the sum of its proper divisors (1).

9855491357 is an equidigital number, since it uses as much as digits as its factorization.

9855491357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804000, while the sum is 56.

The square root of 9855491357 is about 99274.8274085631. The cubic root of 9855491357 is about 2144.0064808834.

The spelling of 9855491357 in words is "nine billion, eight hundred fifty-five million, four hundred ninety-one thousand, three hundred fifty-seven".