101491 has 8 divisors (see below), whose sum is σ = 112784. Its totient is φ = 90720.

The previous prime is 101489. The next prime is 101501. The reversal of 101491 is 194101.

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 101491 - 2¹ = 101489 is a prime.

It is a deceptive number, since it divides R₁₀₁₄₉₀.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (101411) 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, 376 + ... + 586.

It is an arithmetic number, because the mean of its divisors is an integer number (14098).

2¹⁰¹⁴⁹¹ is an apocalyptic number.

101491 is a deficient number, since it is larger than the sum of its proper divisors (11293).

101491 is a wasteful number, since it uses less digits than its factorization.

101491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 101491 is about 318.5765214199. The cubic root of 101491 is about 46.6454381905.

Subtracting from 101491 its sum of digits (16), we obtain a triangular number (101475 = T₄₅₀).

Adding to 101491 its reverse (194101), we get a palindrome (295592).

The spelling of 101491 in words is "one hundred one thousand, four hundred ninety-one".