101531321 has 2 divisors, whose sum is σ = 101531322. Its totient is φ = 101531320.

The previous prime is 101531273. The next prime is 101531329. The reversal of 101531321 is 123135101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66259600 + 35271721 = 8140^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 101531321 - 2¹⁴ = 101514937 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101531321.

It is not a weakly prime, because it can be changed into another prime (101531329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50765660 + 50765661.

It is an arithmetic number, because the mean of its divisors is an integer number (50765661).

Almost surely, 2^101531321 is an apocalyptic number.

It is an amenable number.

101531321 is a deficient number, since it is larger than the sum of its proper divisors (1).

101531321 is an equidigital number, since it uses as much as digits as its factorization.

101531321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 101531321 is about 10076.2751550362. The cubic root of 101531321 is about 466.5161457298.

Adding to 101531321 its reverse (123135101), we get a palindrome (224666422).

The spelling of 101531321 in words is "one hundred one million, five hundred thirty-one thousand, three hundred twenty-one".