312121001 has 4 divisors (see below), whose sum is σ = 312201600. Its totient is φ = 312040404.

The previous prime is 312120973. The next prime is 312121013. The reversal of 312121001 is 100121213.

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 a de Polignac number, because none of the positive numbers 2^k-312121001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312121091) 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, 34181 + ... + 42338.

It is an arithmetic number, because the mean of its divisors is an integer number (78050400).

Almost surely, 2^312121001 is an apocalyptic number.

It is an amenable number.

312121001 is a deficient number, since it is larger than the sum of its proper divisors (80599).

312121001 is an equidigital number, since it uses as much as digits as its factorization.

312121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80598.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 312121001 is about 17666.9465669651. The cubic root of 312121001 is about 678.3299567526.

Adding to 312121001 its reverse (100121213), we get a palindrome (412242214).

The spelling of 312121001 in words is "three hundred twelve million, one hundred twenty-one thousand, one".