311021023 has 2 divisors, whose sum is σ = 311021024. Its totient is φ = 311021022.

The previous prime is 311021017. The next prime is 311021057. The reversal of 311021023 is 320120113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311021023 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 311020994 and 311021012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311021083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155510511 + 155510512.

It is an arithmetic number, because the mean of its divisors is an integer number (155510512).

Almost surely, 2^311021023 is an apocalyptic number.

311021023 is a deficient number, since it is larger than the sum of its proper divisors (1).

311021023 is an equidigital number, since it uses as much as digits as its factorization.

311021023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 311021023 is about 17635.7881309569. The cubic root of 311021023 is about 677.5321611617.

Adding to 311021023 its reverse (320120113), we get a palindrome (631141136).

The spelling of 311021023 in words is "three hundred eleven million, twenty-one thousand, twenty-three".