148820781 has 4 divisors (see below), whose sum is σ = 198427712. Its totient is φ = 99213852.

The previous prime is 148820731. The next prime is 148820783. The reversal of 148820781 is 187028841.

It is a happy number.

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.

It is not a de Polignac number, because 148820781 - 2⁶ = 148820717 is a prime.

It is a super-2 number, since 2×148820781² = 44295249714899922, 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 (148820783) 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, 24803461 + ... + 24803466.

It is an arithmetic number, because the mean of its divisors is an integer number (49606928).

Almost surely, 2^148820781 is an apocalyptic number.

It is an amenable number.

148820781 is a deficient number, since it is larger than the sum of its proper divisors (49606931).

148820781 is an equidigital number, since it uses as much as digits as its factorization.

148820781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49606930.

The product of its (nonzero) digits is 28672, while the sum is 39.

The square root of 148820781 is about 12199.2123106371. The cubic root of 148820781 is about 529.9332786544.

The spelling of 148820781 in words is "one hundred forty-eight million, eight hundred twenty thousand, seven hundred eighty-one".