1211697992 has 36 divisors (see below), whose sum is σ = 2353514265. Its totient is φ = 584828640.

The previous prime is 1211697979. The next prime is 1211698013. The reversal of 1211697992 is 2997961121.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1175529796 + 36168196 = 34286^2 + 6014^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24614.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3051938 + ... + 3052334.

Almost surely, 2^1211697992 is an apocalyptic number.

It is an amenable number.

1211697992 is a deficient number, since it is larger than the sum of its proper divisors (1141816273).

1211697992 is an frugal number, since it uses more digits than its factorization.

1211697992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 430 counting only the distinct ones).

The product of its digits is 122472, while the sum is 47.

The square root of 1211697992 is about 34809.4526242514. The cubic root of 1211697992 is about 1066.1004567014.

The spelling of 1211697992 in words is "one billion, two hundred eleven million, six hundred ninety-seven thousand, nine hundred ninety-two".