1231220001 has 8 divisors (see below), whose sum is σ = 1790865504. Its totient is φ = 746193920.

The previous prime is 1231219967. The next prime is 1231220033. The reversal of 1231220001 is 1000221321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231220001 - 2⁹ = 1231219489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231221001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18654816 + ... + 18654881.

It is an arithmetic number, because the mean of its divisors is an integer number (223858188).

Almost surely, 2^1231220001 is an apocalyptic number.

1231220001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231220001 is a deficient number, since it is larger than the sum of its proper divisors (559645503).

1231220001 is a wasteful number, since it uses less digits than its factorization.

1231220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37309711.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1231220001 is about 35088.7446483912. The cubic root of 1231220001 is about 1071.7953963793.

Adding to 1231220001 its reverse (1000221321), we get a palindrome (2231441322).

The spelling of 1231220001 in words is "one billion, two hundred thirty-one million, two hundred twenty thousand, one".