101387521 has 2 divisors, whose sum is σ = 101387522. Its totient is φ = 101387520.

The previous prime is 101387491. The next prime is 101387543. The reversal of 101387521 is 125783101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51840000 + 49547521 = 7200^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 101387521 - 2¹⁵ = 101354753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101387521.

It is not a weakly prime, because it can be changed into another prime (101387621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50693760 + 50693761.

It is an arithmetic number, because the mean of its divisors is an integer number (50693761).

Almost surely, 2^101387521 is an apocalyptic number.

It is an amenable number.

101387521 is a deficient number, since it is larger than the sum of its proper divisors (1).

101387521 is an equidigital number, since it uses as much as digits as its factorization.

101387521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 101387521 is about 10069.1370533924. The cubic root of 101387521 is about 466.2957975747.

The spelling of 101387521 in words is "one hundred one million, three hundred eighty-seven thousand, five hundred twenty-one".