147491 has 4 divisors (see below), whose sum is σ = 149352. Its totient is φ = 145632.

The previous prime is 147487. The next prime is 147503. The reversal of 147491 is 194741.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194741 = 23 ⋅8467.

It is a cyclic number.

It is not a de Polignac number, because 147491 - 2² = 147487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 147491.

It is not an unprimeable number, because it can be changed into a prime (147401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806 + ... + 971.

It is an arithmetic number, because the mean of its divisors is an integer number (37338).

147491 is a Friedman number, since it can be written as 9*(4+4^7)-1*1, using all its digits and the basic arithmetic operations.

2¹⁴⁷⁴⁹¹ is an apocalyptic number.

147491 is a deficient number, since it is larger than the sum of its proper divisors (1861).

147491 is an equidigital number, since it uses as much as digits as its factorization.

147491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860.

The product of its digits is 1008, while the sum is 26.

The square root of 147491 is about 384.0455702127. The cubic root of 147491 is about 52.8350156087.

The spelling of 147491 in words is "one hundred forty-seven thousand, four hundred ninety-one".