145878891 has 16 divisors (see below), whose sum is σ = 197406720. Its totient is φ = 95808800.

The previous prime is 145878869. The next prime is 145878911. The reversal of 145878891 is 198878541.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 145878891 - 2⁷ = 145878763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145878851) 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 15 ways as a sum of consecutive naturals, for example, 126166 + ... + 127316.

It is an arithmetic number, because the mean of its divisors is an integer number (12337920).

Almost surely, 2^145878891 is an apocalyptic number.

145878891 is a deficient number, since it is larger than the sum of its proper divisors (51527829).

145878891 is a wasteful number, since it uses less digits than its factorization.

145878891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746.

The product of its digits is 645120, while the sum is 51.

The square root of 145878891 is about 12078.0334078028. The cubic root of 145878891 is about 526.4181052610.

The spelling of 145878891 in words is "one hundred forty-five million, eight hundred seventy-eight thousand, eight hundred ninety-one".