105821501 has 2 divisors, whose sum is σ = 105821502. Its totient is φ = 105821500.

The previous prime is 105821489. The next prime is 105821531. The reversal of 105821501 is 105128501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85562500 + 20259001 = 9250^2 + 4501^2 .

It is a cyclic number.

It is not a de Polignac number, because 105821501 - 2¹⁸ = 105559357 is a prime.

It is a super-2 number, since 2×105821501² = 22396380147786002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105821531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52910750 + 52910751.

It is an arithmetic number, because the mean of its divisors is an integer number (52910751).

Almost surely, 2^105821501 is an apocalyptic number.

It is an amenable number.

105821501 is a deficient number, since it is larger than the sum of its proper divisors (1).

105821501 is an equidigital number, since it uses as much as digits as its factorization.

105821501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 105821501 is about 10286.9578107427. The cubic root of 105821501 is about 472.9965493716.

The spelling of 105821501 in words is "one hundred five million, eight hundred twenty-one thousand, five hundred one".