1211019697 has 2 divisors, whose sum is σ = 1211019698. Its totient is φ = 1211019696.

The previous prime is 1211019679. The next prime is 1211019709. The reversal of 1211019697 is 7969101121.

Together with previous prime (1211019679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1072628001 + 138391696 = 32751^2 + 11764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211019697 - 2¹⁵ = 1210986929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211019637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605509848 + 605509849.

It is an arithmetic number, because the mean of its divisors is an integer number (605509849).

Almost surely, 2^1211019697 is an apocalyptic number.

It is an amenable number.

1211019697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211019697 is an equidigital number, since it uses as much as digits as its factorization.

1211019697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 37.

The square root of 1211019697 is about 34799.7082890073. The cubic root of 1211019697 is about 1065.9014891948.

The spelling of 1211019697 in words is "one billion, two hundred eleven million, nineteen thousand, six hundred ninety-seven".