145747561 has 4 divisors (see below), whose sum is σ = 146080000. Its totient is φ = 145415124.

The previous prime is 145747549. The next prime is 145747571. The reversal of 145747561 is 165747541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165747541 = 3319 ⋅49939.

It is a cyclic number.

It is not a de Polignac number, because 145747561 - 2⁵ = 145747529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145747501) 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 3 ways as a sum of consecutive naturals, for example, 165561 + ... + 166438.

It is an arithmetic number, because the mean of its divisors is an integer number (36520000).

Almost surely, 2^145747561 is an apocalyptic number.

It is an amenable number.

145747561 is a deficient number, since it is larger than the sum of its proper divisors (332439).

145747561 is an equidigital number, since it uses as much as digits as its factorization.

145747561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332438.

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

The square root of 145747561 is about 12072.5954541681. The cubic root of 145747561 is about 526.2600854904.

The spelling of 145747561 in words is "one hundred forty-five million, seven hundred forty-seven thousand, five hundred sixty-one".