311019623 has 2 divisors, whose sum is σ = 311019624. Its totient is φ = 311019622.

The previous prime is 311019617. The next prime is 311019637. The reversal of 311019623 is 326910113.

It is a weak prime.

It is an emirp because it is prime and its reverse (326910113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311019623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311019592 and 311019601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311019613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155509811 + 155509812.

It is an arithmetic number, because the mean of its divisors is an integer number (155509812).

Almost surely, 2^311019623 is an apocalyptic number.

311019623 is a deficient number, since it is larger than the sum of its proper divisors (1).

311019623 is an equidigital number, since it uses as much as digits as its factorization.

311019623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 311019623 is about 17635.7484388954. The cubic root of 311019623 is about 677.5311445676.

Adding to 311019623 its reverse (326910113), we get a palindrome (637929736).

The spelling of 311019623 in words is "three hundred eleven million, nineteen thousand, six hundred twenty-three".