1211628897 has 24 divisors (see below), whose sum is σ = 1782237600. Its totient is φ = 792972288.

The previous prime is 1211628883. The next prime is 1211628907. The reversal of 1211628897 is 7988261121.

1211628897 is a `hidden beast` number, since 1 + 2 + 11 + 628 + 8 + 9 + 7 = 666.

It is not a de Polignac number, because 1211628897 - 2¹⁴ = 1211612513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211621897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 611254 + ... + 613232.

It is an arithmetic number, because the mean of its divisors is an integer number (74259900).

Almost surely, 2^1211628897 is an apocalyptic number.

It is an amenable number.

1211628897 is a deficient number, since it is larger than the sum of its proper divisors (570608703).

1211628897 is a wasteful number, since it uses less digits than its factorization.

1211628897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197 (or 3194 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 1211628897 is about 34808.4601354326. The cubic root of 1211628897 is about 1066.0801921328.

The spelling of 1211628897 in words is "one billion, two hundred eleven million, six hundred twenty-eight thousand, eight hundred ninety-seven".