31305011 has 2 divisors, whose sum is σ = 31305012. Its totient is φ = 31305010.

The previous prime is 31304993. The next prime is 31305019. The reversal of 31305011 is 11050313.

It is a strong prime.

It is an emirp because it is prime and its reverse (11050313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31305011 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31305019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15652505 + 15652506.

It is an arithmetic number, because the mean of its divisors is an integer number (15652506).

Almost surely, 2^31305011 is an apocalyptic number.

31305011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31305011 is an equidigital number, since it uses as much as digits as its factorization.

31305011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 31305011 is about 5595.0881136940. The cubic root of 31305011 is about 315.1649795054.

Adding to 31305011 its reverse (11050313), we get a palindrome (42355324).

The spelling of 31305011 in words is "thirty-one million, three hundred five thousand, eleven".