61215761 has 8 divisors (see below), whose sum is σ = 62674560. Its totient is φ = 59763568.

The previous prime is 61215751. The next prime is 61215767. The reversal of 61215761 is 16751216.

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 61215761 - 2⁶ = 61215697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61215767) 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, 20555 + ... + 23343.

It is an arithmetic number, because the mean of its divisors is an integer number (7834320).

Almost surely, 2^61215761 is an apocalyptic number.

It is an amenable number.

61215761 is a deficient number, since it is larger than the sum of its proper divisors (1458799).

61215761 is a wasteful number, since it uses less digits than its factorization.

61215761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303.

The product of its digits is 2520, while the sum is 29.

The square root of 61215761 is about 7824.0501659946. The cubic root of 61215761 is about 394.1132937957.

Adding to 61215761 its reverse (16751216), we get a palindrome (77966977).

The spelling of 61215761 in words is "sixty-one million, two hundred fifteen thousand, seven hundred sixty-one".