146670991 has 4 divisors (see below), whose sum is σ = 149157000. Its totient is φ = 144184984.

The previous prime is 146670959. The next prime is 146671003. The reversal of 146670991 is 199076641.

It is a happy number.

146670991 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.

It is a cyclic number.

It is not a de Polignac number, because 146670991 - 2⁵ = 146670959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146670941) 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, 1242916 + ... + 1243033.

It is an arithmetic number, because the mean of its divisors is an integer number (37289250).

Almost surely, 2^146670991 is an apocalyptic number.

146670991 is a deficient number, since it is larger than the sum of its proper divisors (2486009).

146670991 is an equidigital number, since it uses as much as digits as its factorization.

146670991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486008.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 146670991 is about 12110.7799501106. The cubic root of 146670991 is about 527.3691757960.

The spelling of 146670991 in words is "one hundred forty-six million, six hundred seventy thousand, nine hundred ninety-one".