311001421 has 2 divisors, whose sum is σ = 311001422. Its totient is φ = 311001420.

The previous prime is 311001373. The next prime is 311001487. The reversal of 311001421 is 124100113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236852100 + 74149321 = 15390^2 + 8611^2 .

It is a cyclic number.

It is not a de Polignac number, because 311001421 - 2⁹ = 311000909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311001121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155500710 + 155500711.

It is an arithmetic number, because the mean of its divisors is an integer number (155500711).

Almost surely, 2^311001421 is an apocalyptic number.

It is an amenable number.

311001421 is a deficient number, since it is larger than the sum of its proper divisors (1).

311001421 is an equidigital number, since it uses as much as digits as its factorization.

311001421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 311001421 is about 17635.2323772612. The cubic root of 311001421 is about 677.5179271138.

Adding to 311001421 its reverse (124100113), we get a palindrome (435101534).

The spelling of 311001421 in words is "three hundred eleven million, one thousand, four hundred twenty-one".