1211371697 has 2 divisors, whose sum is σ = 1211371698. Its totient is φ = 1211371696.

The previous prime is 1211371633. The next prime is 1211371699. The reversal of 1211371697 is 7961731121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1053391936 + 157979761 = 32456^2 + 12569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211371697 - 2⁶ = 1211371633 is a prime.

Together with 1211371699, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211371697.

It is not a weakly prime, because it can be changed into another prime (1211371699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605685848 + 605685849.

It is an arithmetic number, because the mean of its divisors is an integer number (605685849).

Almost surely, 2^1211371697 is an apocalyptic number.

It is an amenable number.

1211371697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211371697 is an equidigital number, since it uses as much as digits as its factorization.

1211371697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 38.

The square root of 1211371697 is about 34804.7654352102. The cubic root of 1211371697 is about 1066.0047523041.

The spelling of 1211371697 in words is "one billion, two hundred eleven million, three hundred seventy-one thousand, six hundred ninety-seven".