1205898091357 has 2 divisors, whose sum is σ = 1205898091358. Its totient is φ = 1205898091356.

The previous prime is 1205898091351. The next prime is 1205898091421. The reversal of 1205898091357 is 7531908985021.

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., 732965425956 + 472932665401 = 856134^2 + 687701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205898091357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205898091351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602949045678 + 602949045679.

It is an arithmetic number, because the mean of its divisors is an integer number (602949045679).

Almost surely, 2^{1205898091357} is an apocalyptic number.

It is an amenable number.

1205898091357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205898091357 is an equidigital number, since it uses as much as digits as its factorization.

1205898091357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 58.

The spelling of 1205898091357 in words is "one trillion, two hundred five billion, eight hundred ninety-eight million, ninety-one thousand, three hundred fifty-seven".