149491 has 2 divisors, whose sum is σ = 149492. Its totient is φ = 149490.

The previous prime is 149489. The next prime is 149497. The reversal of 149491 is 194941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 149491 - 2¹ = 149489 is a prime.

It is a super-3 number, since 3×149491³ = 10022276863733313, which contains 333 as substring.

Together with 149489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74745 + 74746.

It is an arithmetic number, because the mean of its divisors is an integer number (74746).

2¹⁴⁹⁴⁹¹ is an apocalyptic number.

149491 is a deficient number, since it is larger than the sum of its proper divisors (1).

149491 is an equidigital number, since it uses as much as digits as its factorization.

149491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 149491 is about 386.6406600450. The cubic root of 149491 is about 53.0727611060.

The spelling of 149491 in words is "one hundred forty-nine thousand, four hundred ninety-one".