100732561 has 4 divisors (see below), whose sum is σ = 100796400. Its totient is φ = 100668724.

The previous prime is 100732559. The next prime is 100732579. The reversal of 100732561 is 165237001.

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: 165237001 = 659 ⋅250739.

It is a cyclic number.

It is not a de Polignac number, because 100732561 - 2¹ = 100732559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100732591) 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, 29491 + ... + 32728.

It is an arithmetic number, because the mean of its divisors is an integer number (25199100).

Almost surely, 2^100732561 is an apocalyptic number.

It is an amenable number.

100732561 is a deficient number, since it is larger than the sum of its proper divisors (63839).

100732561 is an equidigital number, since it uses as much as digits as its factorization.

100732561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63838.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 100732561 is about 10036.5612138820. The cubic root of 100732561 is about 465.2895425691.

Adding to 100732561 its reverse (165237001), we get a palindrome (265969562).

The spelling of 100732561 in words is "one hundred million, seven hundred thirty-two thousand, five hundred sixty-one".