148789991 has 8 divisors (see below), whose sum is σ = 170997120. Its totient is φ = 126820728.

The previous prime is 148789961. The next prime is 148789997. The reversal of 148789991 is 199987841.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-148789991 is a prime.

It is a super-2 number, since 2×148789991² = 44276922843560162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148789997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58121 + ... + 60626.

It is an arithmetic number, because the mean of its divisors is an integer number (21374640).

Almost surely, 2^148789991 is an apocalyptic number.

148789991 is a deficient number, since it is larger than the sum of its proper divisors (22207129).

148789991 is a wasteful number, since it uses less digits than its factorization.

148789991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118933.

The product of its digits is 1306368, while the sum is 56.

The square root of 148789991 is about 12197.9502786329. The cubic root of 148789991 is about 529.8967296121.

The spelling of 148789991 in words is "one hundred forty-eight million, seven hundred eighty-nine thousand, nine hundred ninety-one".