61918133 has 4 divisors (see below), whose sum is σ = 61996620. Its totient is φ = 61839648.

The previous prime is 61918121. The next prime is 61918147. The reversal of 61918133 is 33181916.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36747844 + 25170289 = 6062^2 + 5017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61918133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61918133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61918163) 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, 38048 + ... + 39641.

It is an arithmetic number, because the mean of its divisors is an integer number (15499155).

Almost surely, 2^61918133 is an apocalyptic number.

It is an amenable number.

61918133 is a deficient number, since it is larger than the sum of its proper divisors (78487).

61918133 is an equidigital number, since it uses as much as digits as its factorization.

61918133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78486.

The product of its digits is 3888, while the sum is 32.

The square root of 61918133 is about 7868.8075970886. The cubic root of 61918133 is about 395.6148795523.

The spelling of 61918133 in words is "sixty-one million, nine hundred eighteen thousand, one hundred thirty-three".