100521309 has 16 divisors (see below), whose sum is σ = 155773440. Its totient is φ = 56466480.

The previous prime is 100521307. The next prime is 100521319. The reversal of 100521309 is 903125001.

It is not a de Polignac number, because 100521309 - 2¹ = 100521307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100521307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39327 + ... + 41804.

It is an arithmetic number, because the mean of its divisors is an integer number (9735840).

Almost surely, 2^100521309 is an apocalyptic number.

It is an amenable number.

100521309 is a deficient number, since it is larger than the sum of its proper divisors (55252131).

100521309 is an equidigital number, since it uses as much as digits as its factorization.

100521309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81200.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 100521309 is about 10026.0315678737. The cubic root of 100521309 is about 464.9640531814.

The spelling of 100521309 in words is "one hundred million, five hundred twenty-one thousand, three hundred nine".