147691 has 4 divisors (see below), whose sum is σ = 149112. Its totient is φ = 146272.

The previous prime is 147689. The next prime is 147703. The reversal of 147691 is 196741.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 147691 - 2¹ = 147689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147661) 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, 541 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (37278).

2¹⁴⁷⁶⁹¹ is an apocalyptic number.

147691 is a deficient number, since it is larger than the sum of its proper divisors (1421).

147691 is a wasteful number, since it uses less digits than its factorization.

147691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420.

The product of its digits is 1512, while the sum is 28.

The square root of 147691 is about 384.3058677668. The cubic root of 147691 is about 52.8588865124.

It can be divided in two parts, 147 and 691, that added together give a palindrome (838).

The spelling of 147691 in words is "one hundred forty-seven thousand, six hundred ninety-one".