101203561 has 4 divisors (see below), whose sum is σ = 104468224. Its totient is φ = 97938900.

The previous prime is 101203517. The next prime is 101203579. The reversal of 101203561 is 165302101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165302101 = 17 ⋅9723653.

It is a cyclic number.

It is not a de Polignac number, because 101203561 - 2¹⁹ = 100679273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101206561) 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, 1632285 + ... + 1632346.

It is an arithmetic number, because the mean of its divisors is an integer number (26117056).

Almost surely, 2^101203561 is an apocalyptic number.

It is an amenable number.

101203561 is a deficient number, since it is larger than the sum of its proper divisors (3264663).

101203561 is an equidigital number, since it uses as much as digits as its factorization.

101203561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264662.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 101203561 is about 10059.9980616300. The cubic root of 101203561 is about 466.0136073317.

Adding to 101203561 its reverse (165302101), we get a palindrome (266505662).

The spelling of 101203561 in words is "one hundred one million, two hundred three thousand, five hundred sixty-one".