61918813 has 8 divisors (see below), whose sum is σ = 68307840. Its totient is φ = 55656480.

The previous prime is 61918807. The next prime is 61918837. The reversal of 61918813 is 31881916.

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

It is a de Polignac number, because none of the positive numbers 2^k-61918813 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 (61918013) 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, 30645 + ... + 32602.

It is an arithmetic number, because the mean of its divisors is an integer number (8538480).

Almost surely, 2^61918813 is an apocalyptic number.

It is an amenable number.

61918813 is a deficient number, since it is larger than the sum of its proper divisors (6389027).

61918813 is a wasteful number, since it uses less digits than its factorization.

61918813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63347.

The product of its digits is 10368, while the sum is 37.

The square root of 61918813 is about 7868.8508055497. The cubic root of 61918813 is about 395.6163277933.

The spelling of 61918813 in words is "sixty-one million, nine hundred eighteen thousand, eight hundred thirteen".