148643781 has 36 divisors (see below), whose sum is σ = 235990944. Its totient is φ = 83123040.

The previous prime is 148643773. The next prime is 148643797. The reversal of 148643781 is 187346841.

It is not a de Polignac number, because 148643781 - 2³ = 148643773 is a prime.

It is a super-2 number, since 2×148643781² = 44189947259951922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148643701) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60136 + ... + 62558.

It is an arithmetic number, because the mean of its divisors is an integer number (6555304).

Almost surely, 2^148643781 is an apocalyptic number.

148643781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

148643781 is a deficient number, since it is larger than the sum of its proper divisors (87347163).

148643781 is a wasteful number, since it uses less digits than its factorization.

148643781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474 (or 2450 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 148643781 is about 12191.9555855490. The cubic root of 148643781 is about 529.7231032551.

The spelling of 148643781 in words is "one hundred forty-eight million, six hundred forty-three thousand, seven hundred eighty-one".