100132561 has 4 divisors (see below), whose sum is σ = 100152832. Its totient is φ = 100112292.

The previous prime is 100132519. The next prime is 100132631. The reversal of 100132561 is 165231001.

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: 165231001 = 13 ⋅12710077.

It is a cyclic number.

It is not a de Polignac number, because 100132561 - 2¹³ = 100124369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100132661) 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, 2656 + ... + 14398.

It is an arithmetic number, because the mean of its divisors is an integer number (25038208).

Almost surely, 2^100132561 is an apocalyptic number.

It is an amenable number.

100132561 is a deficient number, since it is larger than the sum of its proper divisors (20271).

100132561 is an equidigital number, since it uses as much as digits as its factorization.

100132561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20270.

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

The square root of 100132561 is about 10006.6258549023. The cubic root of 100132561 is about 464.3638906871.

Adding to 100132561 its reverse (165231001), we get a palindrome (265363562).

The spelling of 100132561 in words is "one hundred million, one hundred thirty-two thousand, five hundred sixty-one".