1213123001 has 4 divisors (see below), whose sum is σ = 1276971600. Its totient is φ = 1149274404.

The previous prime is 1213122991. The next prime is 1213123003. The reversal of 1213123001 is 1003213121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213123001 - 2¹⁴ = 1213106617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213123003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31924271 + ... + 31924308.

It is an arithmetic number, because the mean of its divisors is an integer number (319242900).

Almost surely, 2^1213123001 is an apocalyptic number.

It is an amenable number.

1213123001 is a deficient number, since it is larger than the sum of its proper divisors (63848599).

1213123001 is an equidigital number, since it uses as much as digits as its factorization.

1213123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63848598.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1213123001 is about 34829.9153171523. The cubic root of 1213123001 is about 1066.5182196521.

Adding to 1213123001 its reverse (1003213121), we get a palindrome (2216336122).

The spelling of 1213123001 in words is "one billion, two hundred thirteen million, one hundred twenty-three thousand, one".