31111221353 has 2 divisors, whose sum is σ = 31111221354. Its totient is φ = 31111221352.

The previous prime is 31111221311. The next prime is 31111221367. The reversal of 31111221353 is 35312211113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30850463449 + 260757904 = 175643^2 + 16148^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111221353 - 2⁶ = 31111221289 is a prime.

It is not a weakly prime, because it can be changed into another prime (31111821353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555610676 + 15555610677.

It is an arithmetic number, because the mean of its divisors is an integer number (15555610677).

Almost surely, 2^31111221353 is an apocalyptic number.

It is an amenable number.

31111221353 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111221353 is an equidigital number, since it uses as much as digits as its factorization.

31111221353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

Adding to 31111221353 its reverse (35312211113), we get a palindrome (66423432466).

The spelling of 31111221353 in words is "thirty-one billion, one hundred eleven million, two hundred twenty-one thousand, three hundred fifty-three".