145561823 has 4 divisors (see below), whose sum is σ = 158794728. Its totient is φ = 132328920.

The previous prime is 145561813. The next prime is 145561853. The reversal of 145561823 is 328165541.

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 145561823 - 2²⁰ = 144513247 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 (145561813) 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, 6616436 + ... + 6616457.

It is an arithmetic number, because the mean of its divisors is an integer number (39698682).

Almost surely, 2^145561823 is an apocalyptic number.

145561823 is a deficient number, since it is larger than the sum of its proper divisors (13232905).

145561823 is a wasteful number, since it uses less digits than its factorization.

145561823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13232904.

The product of its digits is 28800, while the sum is 35.

The square root of 145561823 is about 12064.9004554534. The cubic root of 145561823 is about 526.0364384150.

The spelling of 145561823 in words is "one hundred forty-five million, five hundred sixty-one thousand, eight hundred twenty-three".