106628521 has 2 divisors, whose sum is σ = 106628522. Its totient is φ = 106628520.

The previous prime is 106628507. The next prime is 106628537. The reversal of 106628521 is 125826601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61402896 + 45225625 = 7836^2 + 6725^2 .

It is an emirp because it is prime and its reverse (125826601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 106628521 - 2¹³ = 106620329 is a prime.

It is a super-2 number, since 2×106628521² = 22739282981294882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (106623521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53314260 + 53314261.

It is an arithmetic number, because the mean of its divisors is an integer number (53314261).

Almost surely, 2^106628521 is an apocalyptic number.

It is an amenable number.

106628521 is a deficient number, since it is larger than the sum of its proper divisors (1).

106628521 is an equidigital number, since it uses as much as digits as its factorization.

106628521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 106628521 is about 10326.1087056064. The cubic root of 106628521 is about 474.1959004973.

The spelling of 106628521 in words is "one hundred six million, six hundred twenty-eight thousand, five hundred twenty-one".