106621509 has 4 divisors (see below), whose sum is σ = 142162016. Its totient is φ = 71081004.

The previous prime is 106621507. The next prime is 106621513. The reversal of 106621509 is 905126601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 106621509 - 2¹ = 106621507 is a prime.

It is a super-2 number, since 2×106621509² = 22736292362874162, 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 (106621507) 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, 17770249 + ... + 17770254.

It is an arithmetic number, because the mean of its divisors is an integer number (35540504).

Almost surely, 2^106621509 is an apocalyptic number.

It is an amenable number.

106621509 is a deficient number, since it is larger than the sum of its proper divisors (35540507).

106621509 is an equidigital number, since it uses as much as digits as its factorization.

106621509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35540506.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 106621509 is about 10325.7691723184. The cubic root of 106621509 is about 474.1855057345.

The spelling of 106621509 in words is "one hundred six million, six hundred twenty-one thousand, five hundred nine".