311241421 has 2 divisors, whose sum is σ = 311241422.
Its totient is φ = 311241420.
The previous prime is 311241391. The next prime is 311241443. The reversal of 311241421 is 124142113.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 309267396 + 1974025 = 17586^2 + 1405^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-311241421 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (311244421) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155620710 + 155620711.
It is an arithmetic number, because the mean of its divisors is an integer number (155620711).
Almost surely, 2311241421 is an apocalyptic number.
It is an amenable number.
311241421 is a deficient number, since it is larger than the sum of its proper divisors (1).
311241421 is an equidigital number, since it uses as much as digits as its factorization.
311241421 is an evil number, because the sum of its binary digits is even.
The product of its digits is 192, while the sum is 19.
The square root of 311241421 is about 17642.0356251766.
The cubic root of 311241421 is about 677.6921626447.
Adding to 311241421 its reverse (124142113), we get a palindrome (435383534).
The spelling of 311241421 in words is "three hundred eleven million, two hundred forty-one thousand, four hundred twenty-one".