1211464551 has 32 divisors (see below), whose sum is σ = 1801046016. Its totient is φ = 718172000.

The previous prime is 1211464549. The next prime is 1211464603. The reversal of 1211464551 is 1554641121.

It is a cyclic number.

It is not a de Polignac number, because 1211464551 - 2¹ = 1211464549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211464511) 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 31 ways as a sum of consecutive naturals, for example, 304960 + ... + 308906.

It is an arithmetic number, because the mean of its divisors is an integer number (56282688).

Almost surely, 2^1211464551 is an apocalyptic number.

1211464551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211464551 is a deficient number, since it is larger than the sum of its proper divisors (589581465).

1211464551 is a wasteful number, since it uses less digits than its factorization.

1211464551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163.

The product of its digits is 4800, while the sum is 30.

The square root of 1211464551 is about 34806.0993361796. The cubic root of 1211464551 is about 1066.0319887217.

The spelling of 1211464551 in words is "one billion, two hundred eleven million, four hundred sixty-four thousand, five hundred fifty-one".