148973991 has 4 divisors (see below), whose sum is σ = 198631992. Its totient is φ = 99315992.

The previous prime is 148973989. The next prime is 148974019. The reversal of 148973991 is 199379841.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 148973991 - 2¹ = 148973989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148973291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24828996 + ... + 24829001.

It is an arithmetic number, because the mean of its divisors is an integer number (49657998).

Almost surely, 2^148973991 is an apocalyptic number.

148973991 is a deficient number, since it is larger than the sum of its proper divisors (49658001).

148973991 is an equidigital number, since it uses as much as digits as its factorization.

148973991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49658000.

The product of its digits is 489888, while the sum is 51.

The square root of 148973991 is about 12205.4901990866. The cubic root of 148973991 is about 530.1150705410.

The spelling of 148973991 in words is "one hundred forty-eight million, nine hundred seventy-three thousand, nine hundred ninety-one".