101725409 has 4 divisors (see below), whose sum is σ = 101759280. Its totient is φ = 101691540.

The previous prime is 101725397. The next prime is 101725441. The reversal of 101725409 is 904527101.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101725409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101725489) 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, 11939 + ... + 18600.

It is an arithmetic number, because the mean of its divisors is an integer number (25439820).

Almost surely, 2^101725409 is an apocalyptic number.

It is an amenable number.

101725409 is a deficient number, since it is larger than the sum of its proper divisors (33871).

101725409 is an equidigital number, since it uses as much as digits as its factorization.

101725409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33870.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 101725409 is about 10085.9014966437. The cubic root of 101725409 is about 466.8132217138.

The spelling of 101725409 in words is "one hundred one million, seven hundred twenty-five thousand, four hundred nine".