313144021 has 2 divisors, whose sum is σ = 313144022. Its totient is φ = 313144020.

The previous prime is 313143983. The next prime is 313144081. The reversal of 313144021 is 120441313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185340996 + 127803025 = 13614^2 + 11305^2 .

It is a cyclic number.

It is not a de Polignac number, because 313144021 - 2¹⁷ = 313012949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313144021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313144081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156572010 + 156572011.

It is an arithmetic number, because the mean of its divisors is an integer number (156572011).

Almost surely, 2^313144021 is an apocalyptic number.

It is an amenable number.

313144021 is a deficient number, since it is larger than the sum of its proper divisors (1).

313144021 is an equidigital number, since it uses as much as digits as its factorization.

313144021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 313144021 is about 17695.8758189585. The cubic root of 313144021 is about 679.0702554620.

Adding to 313144021 its reverse (120441313), we get a palindrome (433585334).

The spelling of 313144021 in words is "three hundred thirteen million, one hundred forty-four thousand, twenty-one".