31554121 has 2 divisors, whose sum is σ = 31554122. Its totient is φ = 31554120.

The previous prime is 31554077. The next prime is 31554143. The reversal of 31554121 is 12145513.

It is a happy number.

It is an a-pointer prime, because the next prime (31554143) can be obtained adding 31554121 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26378496 + 5175625 = 5136^2 + 2275^2 .

It is an emirp because it is prime and its reverse (12145513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31554121 - 2⁷ = 31553993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31554092 and 31554101.

It is not a weakly prime, because it can be changed into another prime (31554161) 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, 15777060 + 15777061.

It is an arithmetic number, because the mean of its divisors is an integer number (15777061).

Almost surely, 2^31554121 is an apocalyptic number.

It is an amenable number.

31554121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31554121 is an equidigital number, since it uses as much as digits as its factorization.

31554121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 22.

The square root of 31554121 is about 5617.3054928498. The cubic root of 31554121 is about 315.9987481924.

Adding to 31554121 its reverse (12145513), we get a palindrome (43699634).

The spelling of 31554121 in words is "thirty-one million, five hundred fifty-four thousand, one hundred twenty-one".