61218965 has 8 divisors (see below), whose sum is σ = 73505880. Its totient is φ = 48946432.

The previous prime is 61218947. The next prime is 61218973. The reversal of 61218965 is 56981216.

It can be written as a sum of positive squares in 4 ways, for example, as 908209 + 60310756 = 953^2 + 7766^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61218965 - 2¹⁰ = 61217941 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11681 + ... + 16089.

It is an arithmetic number, because the mean of its divisors is an integer number (9188235).

Almost surely, 2^61218965 is an apocalyptic number.

It is an amenable number.

61218965 is a deficient number, since it is larger than the sum of its proper divisors (12286915).

61218965 is a wasteful number, since it uses less digits than its factorization.

61218965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7191.

The product of its digits is 25920, while the sum is 38.

The square root of 61218965 is about 7824.2549166039. The cubic root of 61218965 is about 394.1201695683.

The spelling of 61218965 in words is "sixty-one million, two hundred eighteen thousand, nine hundred sixty-five".