106521531 has 4 divisors (see below), whose sum is σ = 142028712. Its totient is φ = 71014352.

The previous prime is 106521523. The next prime is 106521539. The reversal of 106521531 is 135125601.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (106521523) and next prime (106521539).

It is a cyclic number.

It is not a de Polignac number, because 106521531 - 2³ = 106521523 is a prime.

It is a super-2 number, since 2×106521531² = 22693673133167922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (106521539) 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, 17753586 + ... + 17753591.

It is an arithmetic number, because the mean of its divisors is an integer number (35507178).

Almost surely, 2^106521531 is an apocalyptic number.

106521531 is a deficient number, since it is larger than the sum of its proper divisors (35507181).

106521531 is an equidigital number, since it uses as much as digits as its factorization.

106521531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35507180.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 106521531 is about 10320.9268479144. The cubic root of 106521531 is about 474.0372462676.

The spelling of 106521531 in words is "one hundred six million, five hundred twenty-one thousand, five hundred thirty-one".