1229206451 has 20 divisors (see below), whose sum is σ = 1397102520. Its totient is φ = 1081413300.

The previous prime is 1229206417. The next prime is 1229206469. The reversal of 1229206451 is 1546029221.

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 is not a de Polignac number, because 1229206451 - 2¹⁰ = 1229205427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1229206481) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 39651806 + ... + 39651836.

It is an arithmetic number, because the mean of its divisors is an integer number (69855126).

Almost surely, 2^1229206451 is an apocalyptic number.

1229206451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1229206451 is a deficient number, since it is larger than the sum of its proper divisors (167896069).

1229206451 is an frugal number, since it uses more digits than its factorization.

1229206451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1229206451 is about 35060.0406588469. The cubic root of 1229206451 is about 1071.2108024655.

The spelling of 1229206451 in words is "one billion, two hundred twenty-nine million, two hundred six thousand, four hundred fifty-one".