1211604471 has 48 divisors (see below), whose sum is σ = 2218993920. Its totient is φ = 618716160.

The previous prime is 1211604469. The next prime is 1211604473. The reversal of 1211604471 is 1744061121.

1211604471 is a `hidden beast` number, since 1 + 2 + 11 + 604 + 47 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1211604469) and next prime (1211604473).

It is not a de Polignac number, because 1211604471 - 2¹ = 1211604469 is a prime.

It is a super-3 number, since 3×1211604471³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211604473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26071 + ... + 55703.

It is an arithmetic number, because the mean of its divisors is an integer number (46229040).

Almost surely, 2^1211604471 is an apocalyptic number.

1211604471 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211604471 is a deficient number, since it is larger than the sum of its proper divisors (1007389449).

1211604471 is a wasteful number, since it uses less digits than its factorization.

1211604471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29716 (or 29713 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1211604471 is about 34808.1092706858. The cubic root of 1211604471 is about 1066.0730281544.

Adding to 1211604471 its reverse (1744061121), we get a palindrome (2955665592).

The spelling of 1211604471 in words is "one billion, two hundred eleven million, six hundred four thousand, four hundred seventy-one".