145993091 has 4 divisors (see below), whose sum is σ = 147058872. Its totient is φ = 144927312.

The previous prime is 145993079. The next prime is 145993097. The reversal of 145993091 is 190399541.

145993091 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, and also an emirpimes, since its reverse is a distinct semiprime: 190399541 = 17 ⋅11199973.

It is a cyclic number.

It is not a de Polignac number, because 145993091 - 2¹⁴ = 145976707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145993097) 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, 532685 + ... + 532958.

It is an arithmetic number, because the mean of its divisors is an integer number (36764718).

Almost surely, 2^145993091 is an apocalyptic number.

145993091 is a deficient number, since it is larger than the sum of its proper divisors (1065781).

145993091 is a wasteful number, since it uses less digits than its factorization.

145993091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065780.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 145993091 is about 12082.7600737580. The cubic root of 145993091 is about 526.5554366841. Note that the first 3 decimals are identical.

The spelling of 145993091 in words is "one hundred forty-five million, nine hundred ninety-three thousand, ninety-one".