61506243 has 16 divisors (see below), whose sum is σ = 91248640. Its totient is φ = 40946472.

The previous prime is 61506217. The next prime is 61506253. The reversal of 61506243 is 34260516.

61506243 is a `hidden beast` number, since 615 + 0 + 6 + 2 + 43 = 666.

It is not a de Polignac number, because 61506243 - 2¹³ = 61498051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (61506253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27630 + ... + 29772.

It is an arithmetic number, because the mean of its divisors is an integer number (5703040).

Almost surely, 2^61506243 is an apocalyptic number.

61506243 is a deficient number, since it is larger than the sum of its proper divisors (29742397).

61506243 is a wasteful number, since it uses less digits than its factorization.

61506243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215 (or 3209 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 61506243 is about 7842.5915997201. The cubic root of 61506243 is about 394.7356945735.

Adding to 61506243 its reverse (34260516), we get a palindrome (95766759).

The spelling of 61506243 in words is "sixty-one million, five hundred six thousand, two hundred forty-three".