1197857771 has 6 divisors (see below), whose sum is σ = 1316653716. Its totient is φ = 1088961500.

The previous prime is 1197857737. The next prime is 1197857809. The reversal of 1197857771 is 1777587911.

It is not a de Polignac number, because 1197857771 - 2¹⁴ = 1197841387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1197857971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4949705 + ... + 4949946.

It is an arithmetic number, because the mean of its divisors is an integer number (219442286).

Almost surely, 2^1197857771 is an apocalyptic number.

1197857771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1197857771 is a deficient number, since it is larger than the sum of its proper divisors (118795945).

1197857771 is an equidigital number, since it uses as much as digits as its factorization.

1197857771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9899673 (or 9899662 counting only the distinct ones).

The product of its digits is 864360, while the sum is 53.

The square root of 1197857771 is about 34610.0819270917. The cubic root of 1197857771 is about 1062.0258430753.

The spelling of 1197857771 in words is "one billion, one hundred ninety-seven million, eight hundred fifty-seven thousand, seven hundred seventy-one".