1211629897 has 2 divisors, whose sum is σ = 1211629898. Its totient is φ = 1211629896.

The previous prime is 1211629871. The next prime is 1211629901. The reversal of 1211629897 is 7989261121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1183635216 + 27994681 = 34404^2 + 5291^2 .

It is an emirp because it is prime and its reverse (7989261121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211629897 - 2¹⁵ = 1211597129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211629807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605814948 + 605814949.

It is an arithmetic number, because the mean of its divisors is an integer number (605814949).

Almost surely, 2^1211629897 is an apocalyptic number.

It is an amenable number.

1211629897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211629897 is an equidigital number, since it uses as much as digits as its factorization.

1211629897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 1211629897 is about 34808.4744997536. The cubic root of 1211629897 is about 1066.0804854239.

The spelling of 1211629897 in words is "one billion, two hundred eleven million, six hundred twenty-nine thousand, eight hundred ninety-seven".