101961909 has 20 divisors (see below), whose sum is σ = 174073504. Its totient is φ = 58263624.

The previous prime is 101961857. The next prime is 101961917. The reversal of 101961909 is 909169101.

It is not a de Polignac number, because 101961909 - 2⁷ = 101961781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101961919) 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 in 19 ways as a sum of consecutive naturals, for example, 89347 + ... + 90480.

Almost surely, 2^101961909 is an apocalyptic number.

It is an amenable number.

101961909 is a deficient number, since it is larger than the sum of its proper divisors (72111595).

101961909 is an equidigital number, since it uses as much as digits as its factorization.

101961909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179846 (or 179837 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 101961909 is about 10097.6189767687. The cubic root of 101961909 is about 467.1747042628.

The spelling of 101961909 in words is "one hundred one million, nine hundred sixty-one thousand, nine hundred nine".