105390521 has 2 divisors, whose sum is σ = 105390522. Its totient is φ = 105390520.

The previous prime is 105390517. The next prime is 105390533. The reversal of 105390521 is 125093501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105288121 + 102400 = 10261^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 105390521 - 2² = 105390517 is a prime.

It is a super-2 number, since 2×105390521² = 22214323833302882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (105390581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52695260 + 52695261.

It is an arithmetic number, because the mean of its divisors is an integer number (52695261).

Almost surely, 2^105390521 is an apocalyptic number.

It is an amenable number.

105390521 is a deficient number, since it is larger than the sum of its proper divisors (1).

105390521 is an equidigital number, since it uses as much as digits as its factorization.

105390521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 105390521 is about 10265.9885544452. The cubic root of 105390521 is about 472.3535501637.

The spelling of 105390521 in words is "one hundred five million, three hundred ninety thousand, five hundred twenty-one".