148138781 has 8 divisors (see below), whose sum is σ = 173431104. Its totient is φ = 123878880.

The previous prime is 148138747. The next prime is 148138817. The reversal of 148138781 is 187831841.

148138781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 148138781 - 2⁶ = 148138717 is a prime.

It is a super-2 number, since 2×148138781² = 43890196872331922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148138721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257795 + ... + 258368.

It is an arithmetic number, because the mean of its divisors is an integer number (21678888).

Almost surely, 2^148138781 is an apocalyptic number.

It is an amenable number.

148138781 is a deficient number, since it is larger than the sum of its proper divisors (25292323).

148138781 is an equidigital number, since it uses as much as digits as its factorization.

148138781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516211.

The product of its digits is 43008, while the sum is 41.

The square root of 148138781 is about 12171.2275880455. The cubic root of 148138781 is about 529.1225316887.

The spelling of 148138781 in words is "one hundred forty-eight million, one hundred thirty-eight thousand, seven hundred eighty-one".