148981 has 4 divisors (see below), whose sum is σ = 170272. Its totient is φ = 127692.

The previous prime is 148961. The next prime is 148991. The reversal of 148981 is 189841.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189841 = 229 ⋅829.

It is a cyclic number.

It is not a de Polignac number, because 148981 - 2⁵ = 148949 is a prime.

It is a super-2 number, since 2×148981² = 44390676722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148921) 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, 10635 + ... + 10648.

It is an arithmetic number, because the mean of its divisors is an integer number (42568).

2¹⁴⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

148981 is a deficient number, since it is larger than the sum of its proper divisors (21291).

148981 is an equidigital number, since it uses as much as digits as its factorization.

148981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21290.

The product of its digits is 2304, while the sum is 31.

The square root of 148981 is about 385.9805694591. The cubic root of 148981 is about 53.0123384114.

The spelling of 148981 in words is "one hundred forty-eight thousand, nine hundred eighty-one".