101632561 has 4 divisors (see below), whose sum is σ = 106051392. Its totient is φ = 97213732.

The previous prime is 101632547. The next prime is 101632589. The reversal of 101632561 is 165236101.

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: 165236101 = 101 ⋅1636001.

It is not a de Polignac number, because 101632561 - 2⁵ = 101632529 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101632961) 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, 2209381 + ... + 2209426.

It is an arithmetic number, because the mean of its divisors is an integer number (26512848).

Almost surely, 2^101632561 is an apocalyptic number.

It is an amenable number.

101632561 is a deficient number, since it is larger than the sum of its proper divisors (4418831).

101632561 is an equidigital number, since it uses as much as digits as its factorization.

101632561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4418830.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 101632561 is about 10081.2975851326. The cubic root of 101632561 is about 466.6711534149.

Adding to 101632561 its reverse (165236101), we get a palindrome (266868662).

The spelling of 101632561 in words is "one hundred one million, six hundred thirty-two thousand, five hundred sixty-one".