148921917 has 4 divisors (see below), whose sum is σ = 198562560. Its totient is φ = 99281276.

The previous prime is 148921907. The next prime is 148921919. The reversal of 148921917 is 719129841.

148921917 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 148921917 - 2⁷ = 148921789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148921919) 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, 24820317 + ... + 24820322.

It is an arithmetic number, because the mean of its divisors is an integer number (49640640).

Almost surely, 2^148921917 is an apocalyptic number.

It is an amenable number.

148921917 is a deficient number, since it is larger than the sum of its proper divisors (49640643).

148921917 is an equidigital number, since it uses as much as digits as its factorization.

148921917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49640642.

The product of its digits is 36288, while the sum is 42.

The square root of 148921917 is about 12203.3567922928. The cubic root of 148921917 is about 530.0532959339.

The spelling of 148921917 in words is "one hundred forty-eight million, nine hundred twenty-one thousand, nine hundred seventeen".