100601561 has 8 divisors (see below), whose sum is σ = 107173920. Its totient is φ = 94156992.

The previous prime is 100601531. The next prime is 100601587. The reversal of 100601561 is 165106001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100601561 - 2⁶ = 100601497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100601521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30320 + ... + 33473.

It is an arithmetic number, because the mean of its divisors is an integer number (13396740).

Almost surely, 2^100601561 is an apocalyptic number.

It is an amenable number.

100601561 is a deficient number, since it is larger than the sum of its proper divisors (6572359).

100601561 is an equidigital number, since it uses as much as digits as its factorization.

100601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63895.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 100601561 is about 10030.0329510924. The cubic root of 100601561 is about 465.0877562049.

Adding to 100601561 its reverse (165106001), we get a palindrome (265707562).

The spelling of 100601561 in words is "one hundred million, six hundred one thousand, five hundred sixty-one".