61518679 has 4 divisors (see below), whose sum is σ = 63181384. Its totient is φ = 59855976.

The previous prime is 61518671. The next prime is 61518703. The reversal of 61518679 is 97681516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61518679 - 2³ = 61518671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61518671) 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, 831297 + ... + 831370.

It is an arithmetic number, because the mean of its divisors is an integer number (15795346).

Almost surely, 2^61518679 is an apocalyptic number.

61518679 is a deficient number, since it is larger than the sum of its proper divisors (1662705).

61518679 is a wasteful number, since it uses less digits than its factorization.

61518679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662704.

The product of its digits is 90720, while the sum is 43.

The square root of 61518679 is about 7843.3844098068. The cubic root of 61518679 is about 394.7622967635.

The spelling of 61518679 in words is "sixty-one million, five hundred eighteen thousand, six hundred seventy-nine".