145561747 has 4 divisors (see below), whose sum is σ = 145588536. Its totient is φ = 145534960.

The previous prime is 145561739. The next prime is 145561813. The reversal of 145561747 is 747165541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747165541 = 29 ⋅25764329.

It is a cyclic number.

It is not a de Polignac number, because 145561747 - 2³ = 145561739 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145561727) 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, 2029 + ... + 17182.

It is an arithmetic number, because the mean of its divisors is an integer number (36397134).

Almost surely, 2^145561747 is an apocalyptic number.

145561747 is a deficient number, since it is larger than the sum of its proper divisors (26789).

145561747 is an equidigital number, since it uses as much as digits as its factorization.

145561747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26788.

The product of its digits is 117600, while the sum is 40.

The square root of 145561747 is about 12064.8973058207. The cubic root of 145561747 is about 526.0363468645.

The spelling of 145561747 in words is "one hundred forty-five million, five hundred sixty-one thousand, seven hundred forty-seven".