1243550001 has 16 divisors (see below), whose sum is σ = 1667191680. Its totient is φ = 824482560.

The previous prime is 1243549999. The next prime is 1243550023. The reversal of 1243550001 is 1000553421.

It is not a de Polignac number, because 1243550001 - 2¹ = 1243549999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243550001.

It is not an unprimeable number, because it can be changed into a prime (1243550101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694215 + ... + 696003.

It is an arithmetic number, because the mean of its divisors is an integer number (104199480).

Almost surely, 2^1243550001 is an apocalyptic number.

It is an amenable number.

1243550001 is a deficient number, since it is larger than the sum of its proper divisors (423641679).

1243550001 is a wasteful number, since it uses less digits than its factorization.

1243550001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1243550001 is about 35264.0043245233. The cubic root of 1243550001 is about 1075.3613354638.

The spelling of 1243550001 in words is "one billion, two hundred forty-three million, five hundred fifty thousand, one".