148720781 has 4 divisors (see below), whose sum is σ = 162240864. Its totient is φ = 135200700.

The previous prime is 148720757. The next prime is 148720801. The reversal of 148720781 is 187027841.

148720781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 148720781 - 2⁶ = 148720717 is a prime.

It is a super-2 number, since 2×148720781² = 44235741402499922, 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 (148720081) 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, 6760025 + ... + 6760046.

It is an arithmetic number, because the mean of its divisors is an integer number (40560216).

Almost surely, 2^148720781 is an apocalyptic number.

148720781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

148720781 is a deficient number, since it is larger than the sum of its proper divisors (13520083).

148720781 is a wasteful number, since it uses less digits than its factorization.

148720781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13520082.

The product of its (nonzero) digits is 25088, while the sum is 38.

The square root of 148720781 is about 12195.1129966065. The cubic root of 148720781 is about 529.8145559833.

The spelling of 148720781 in words is "one hundred forty-eight million, seven hundred twenty thousand, seven hundred eighty-one".