31311101 has 2 divisors, whose sum is σ = 31311102. Its totient is φ = 31311100.

The previous prime is 31311083. The next prime is 31311109. The reversal of 31311101 is 10111313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31248100 + 63001 = 5590^2 + 251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311101 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311109) 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, 15655550 + 15655551.

It is an arithmetic number, because the mean of its divisors is an integer number (15655551).

Almost surely, 2^31311101 is an apocalyptic number.

It is an amenable number.

31311101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311101 is an equidigital number, since it uses as much as digits as its factorization.

31311101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 31311101 is about 5595.6323145825. The cubic root of 31311101 is about 315.1854153208.

Adding to 31311101 its reverse (10111313), we get a palindrome (41422414).

The spelling of 31311101 in words is "thirty-one million, three hundred eleven thousand, one hundred one".