1211718897 has 24 divisors (see below), whose sum is σ = 1777776000. Its totient is φ = 795158208.

The previous prime is 1211718889. The next prime is 1211718899. The reversal of 1211718897 is 7988171121.

It is not a de Polignac number, because 1211718897 - 2³ = 1211718889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211718899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 392004 + ... + 395082.

It is an arithmetic number, because the mean of its divisors is an integer number (74074000).

Almost surely, 2^1211718897 is an apocalyptic number.

It is an amenable number.

1211718897 is a deficient number, since it is larger than the sum of its proper divisors (566057103).

1211718897 is a wasteful number, since it uses less digits than its factorization.

1211718897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757 (or 3754 counting only the distinct ones).

The product of its digits is 56448, while the sum is 45.

The square root of 1211718897 is about 34809.7529005881. The cubic root of 1211718897 is about 1066.1065876851.

The spelling of 1211718897 in words is "one billion, two hundred eleven million, seven hundred eighteen thousand, eight hundred ninety-seven".