149531 has 2 divisors, whose sum is σ = 149532. Its totient is φ = 149530.

The previous prime is 149521. The next prime is 149533. The reversal of 149531 is 135941.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149531 is a prime.

It is a super-2 number, since 2×149531² = 44719039922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 149533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 149497 and 149506.

It is not a weakly prime, because it can be changed into another prime (149533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74765 + 74766.

It is an arithmetic number, because the mean of its divisors is an integer number (74766).

2¹⁴⁹⁵³¹ is an apocalyptic number.

149531 is a deficient number, since it is larger than the sum of its proper divisors (1).

149531 is an equidigital number, since it uses as much as digits as its factorization.

149531 is an odious number, because the sum of its binary digits is odd.

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

The square root of 149531 is about 386.6923842022. The cubic root of 149531 is about 53.0774943255.

The spelling of 149531 in words is "one hundred forty-nine thousand, five hundred thirty-one".