61218471 has 8 divisors (see below), whose sum is σ = 81760240. Its totient is φ = 40744512.

The previous prime is 61218467. The next prime is 61218473. The reversal of 61218471 is 17481216.

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

It is not a de Polignac number, because 61218471 - 2² = 61218467 is a prime.

It is a super-3 number, since 3×61218471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61218473) 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, 14806 + ... + 18483.

It is an arithmetic number, because the mean of its divisors is an integer number (10220030).

Almost surely, 2^61218471 is an apocalyptic number.

61218471 is a deficient number, since it is larger than the sum of its proper divisors (20541769).

61218471 is a wasteful number, since it uses less digits than its factorization.

61218471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33905.

The product of its digits is 2688, while the sum is 30.

The square root of 61218471 is about 7824.2233480391. The cubic root of 61218471 is about 394.1191094617.

Adding to 61218471 its reverse (17481216), we get a palindrome (78699687).

The spelling of 61218471 in words is "sixty-one million, two hundred eighteen thousand, four hundred seventy-one".