1849891697 has 2 divisors, whose sum is σ = 1849891698. Its totient is φ = 1849891696.

The previous prime is 1849891657. The next prime is 1849891711. The reversal of 1849891697 is 7961989481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1335463936 + 514427761 = 36544^2 + 22681^2 .

It is an emirp because it is prime and its reverse (7961989481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1849891697 - 2⁸ = 1849891441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1849891657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 924945848 + 924945849.

It is an arithmetic number, because the mean of its divisors is an integer number (924945849).

Almost surely, 2^1849891697 is an apocalyptic number.

It is an amenable number.

1849891697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1849891697 is an equidigital number, since it uses as much as digits as its factorization.

1849891697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 62.

The square root of 1849891697 is about 43010.3673199846. The cubic root of 1849891697 is about 1227.5770702519.

The spelling of 1849891697 in words is "one billion, eight hundred forty-nine million, eight hundred ninety-one thousand, six hundred ninety-seven".