61618243 has 8 divisors (see below), whose sum is σ = 64825200. Its totient is φ = 58483488.

The previous prime is 61618237. The next prime is 61618247. The reversal of 61618243 is 34281616.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61618243 - 2²⁵ = 28063811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61618247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16296 + ... + 19717.

It is an arithmetic number, because the mean of its divisors is an integer number (8103150).

Almost surely, 2^61618243 is an apocalyptic number.

61618243 is a deficient number, since it is larger than the sum of its proper divisors (3206957).

61618243 is a wasteful number, since it uses less digits than its factorization.

61618243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36101.

The product of its digits is 6912, while the sum is 31.

The square root of 61618243 is about 7849.7288488202. The cubic root of 61618243 is about 394.9751477180.

Adding to 61618243 its reverse (34281616), we get a palindrome (95899859).

It can be divided in two parts, 616182 and 43, that added together give a square (616225 = 785²).

The spelling of 61618243 in words is "sixty-one million, six hundred eighteen thousand, two hundred forty-three".