153491 has 4 divisors (see below), whose sum is σ = 165312. Its totient is φ = 141672.

The previous prime is 153487. The next prime is 153499. The reversal of 153491 is 194351.

It is a happy number.

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 153491 - 2² = 153487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153499) 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, 5891 + ... + 5916.

It is an arithmetic number, because the mean of its divisors is an integer number (41328).

2¹⁵³⁴⁹¹ is an apocalyptic number.

153491 is a deficient number, since it is larger than the sum of its proper divisors (11821).

153491 is a wasteful number, since it uses less digits than its factorization.

153491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11820.

The product of its digits is 540, while the sum is 23.

The square root of 153491 is about 391.7792745922. The cubic root of 153491 is about 53.5419649200.

The spelling of 153491 in words is "one hundred fifty-three thousand, four hundred ninety-one".