61618749 has 8 divisors (see below), whose sum is σ = 82805760. Its totient is φ = 40755456.

The previous prime is 61618747. The next prime is 61618751. The reversal of 61618749 is 94781616.

It is an interprime number because it is at equal distance from previous prime (61618747) and next prime (61618751).

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

It is not a de Polignac number, because 61618749 - 2¹ = 61618747 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 61618749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61618747) 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, 80484 + ... + 81245.

It is an arithmetic number, because the mean of its divisors is an integer number (10350720).

Almost surely, 2^61618749 is an apocalyptic number.

It is an amenable number.

61618749 is a deficient number, since it is larger than the sum of its proper divisors (21187011).

61618749 is a wasteful number, since it uses less digits than its factorization.

61618749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161859.

The product of its digits is 72576, while the sum is 42.

The square root of 61618749 is about 7849.7610791667. The cubic root of 61618749 is about 394.9762288745.

The spelling of 61618749 in words is "sixty-one million, six hundred eighteen thousand, seven hundred forty-nine".