149381 has 2 divisors, whose sum is σ = 149382. Its totient is φ = 149380.

The previous prime is 149377. The next prime is 149393. The reversal of 149381 is 183941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148225 + 1156 = 385^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 149381 - 2² = 149377 is a prime.

It is a super-2 number, since 2×149381² = 44629366322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 149381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74690 + 74691.

It is an arithmetic number, because the mean of its divisors is an integer number (74691).

2¹⁴⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

149381 is a deficient number, since it is larger than the sum of its proper divisors (1).

149381 is an equidigital number, since it uses as much as digits as its factorization.

149381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 149381 is about 386.4983829203. The cubic root of 149381 is about 53.0597403974.

The spelling of 149381 in words is "one hundred forty-nine thousand, three hundred eighty-one".