61216761 has 8 divisors (see below), whose sum is σ = 82840864. Its totient is φ = 40201920.

The previous prime is 61216751. The next prime is 61216763. The reversal of 61216761 is 16761216.

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

It is not a de Polignac number, because 61216761 - 2⁷ = 61216633 is a prime.

It is a super-2 number, since 2×61216761² = 7494983654662242, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61216763) 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, 152080 + ... + 152481.

It is an arithmetic number, because the mean of its divisors is an integer number (10355108).

Almost surely, 2^61216761 is an apocalyptic number.

It is an amenable number.

61216761 is a deficient number, since it is larger than the sum of its proper divisors (21624103).

61216761 is a wasteful number, since it uses less digits than its factorization.

61216761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304631.

The product of its digits is 3024, while the sum is 30.

The square root of 61216761 is about 7824.1140712543. The cubic root of 61216761 is about 394.1154398179.

Adding to 61216761 its reverse (16761216), we get a palindrome (77977977).

The spelling of 61216761 in words is "sixty-one million, two hundred sixteen thousand, seven hundred sixty-one".