148856991 has 4 divisors (see below), whose sum is σ = 198475992. Its totient is φ = 99237992.

The previous prime is 148856987. The next prime is 148856993. The reversal of 148856991 is 199658841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199658841 = 3 ⋅66552947.

It is a cyclic number.

It is not a de Polignac number, because 148856991 - 2² = 148856987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148856993) 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, 24809496 + ... + 24809501.

It is an arithmetic number, because the mean of its divisors is an integer number (49618998).

Almost surely, 2^148856991 is an apocalyptic number.

148856991 is a deficient number, since it is larger than the sum of its proper divisors (49619001).

148856991 is an equidigital number, since it uses as much as digits as its factorization.

148856991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49619000.

The product of its digits is 622080, while the sum is 51.

The square root of 148856991 is about 12200.6963325869. The cubic root of 148856991 is about 529.9762550178.

The spelling of 148856991 in words is "one hundred forty-eight million, eight hundred fifty-six thousand, nine hundred ninety-one".