61218461 has 8 divisors (see below), whose sum is σ = 63000504. Its totient is φ = 59443200.

The previous prime is 61218431. The next prime is 61218467. The reversal of 61218461 is 16481216.

It can be written as a sum of positive squares in 4 ways, for example, as 46922500 + 14295961 = 6850^2 + 3781^2 .

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 61218461 - 2¹⁴ = 61202077 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 (61218467) 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, 20861 + ... + 23613.

It is an arithmetic number, because the mean of its divisors is an integer number (7875063).

Almost surely, 2^61218461 is an apocalyptic number.

It is an amenable number.

61218461 is a deficient number, since it is larger than the sum of its proper divisors (1782043).

61218461 is a wasteful number, since it uses less digits than its factorization.

61218461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391.

The product of its digits is 2304, while the sum is 29.

The square root of 61218461 is about 7824.2227089980. Note that the first 3 decimals coincide. The cubic root of 61218461 is about 394.1190880020.

Adding to 61218461 its reverse (16481216), we get a palindrome (77699677).

The spelling of 61218461 in words is "sixty-one million, two hundred eighteen thousand, four hundred sixty-one".