101645521 has 2 divisors, whose sum is σ = 101645522. Its totient is φ = 101645520.

The previous prime is 101645513. The next prime is 101645539. The reversal of 101645521 is 125546101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61449921 + 40195600 = 7839^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 101645521 - 2³ = 101645513 is a prime.

It is a super-2 number, since 2×101645521² = 20663623878722882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (101645501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50822760 + 50822761.

It is an arithmetic number, because the mean of its divisors is an integer number (50822761).

Almost surely, 2^101645521 is an apocalyptic number.

It is an amenable number.

101645521 is a deficient number, since it is larger than the sum of its proper divisors (1).

101645521 is an equidigital number, since it uses as much as digits as its factorization.

101645521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 101645521 is about 10081.9403390419. The cubic root of 101645521 is about 466.6909889251.

The spelling of 101645521 in words is "one hundred one million, six hundred forty-five thousand, five hundred twenty-one".