31111061 has 2 divisors, whose sum is σ = 31111062. Its totient is φ = 31111060.

The previous prime is 31111057. The next prime is 31111103. The reversal of 31111061 is 16011113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25908100 + 5202961 = 5090^2 + 2281^2 .

It is an emirp because it is prime and its reverse (16011113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31111061 - 2² = 31111057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31111001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555530 + 15555531.

It is an arithmetic number, because the mean of its divisors is an integer number (15555531).

Almost surely, 2^31111061 is an apocalyptic number.

It is an amenable number.

31111061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111061 is an equidigital number, since it uses as much as digits as its factorization.

31111061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 31111061 is about 5577.7290181578. The cubic root of 31111061 is about 314.5127631575.

Adding to 31111061 its reverse (16011113), we get a palindrome (47122174).

The spelling of 31111061 in words is "thirty-one million, one hundred eleven thousand, sixty-one".