106521511 has 4 divisors (see below), whose sum is σ = 106597792. Its totient is φ = 106445232.

The previous prime is 106521509. The next prime is 106521521. The reversal of 106521511 is 115125601.

106521511 = 4211² + 4212² + ... + 4216².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115125601 = 1019 ⋅112979.

It is a cyclic number.

It is not a de Polignac number, because 106521511 - 2¹ = 106521509 is a prime.

It is a super-2 number, since 2×106521511² = 22693664611446242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106521521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36006 + ... + 38851.

It is an arithmetic number, because the mean of its divisors is an integer number (26649448).

Almost surely, 2^106521511 is an apocalyptic number.

106521511 is a deficient number, since it is larger than the sum of its proper divisors (76281).

106521511 is an equidigital number, since it uses as much as digits as its factorization.

106521511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76280.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 106521511 is about 10320.9258790091. The cubic root of 106521511 is about 474.0372165999.

The spelling of 106521511 in words is "one hundred six million, five hundred twenty-one thousand, five hundred eleven".