61616261 has 4 divisors (see below), whose sum is σ = 70418592. Its totient is φ = 52813932.

The previous prime is 61616257. The next prime is 61616311. The reversal of 61616261 is 16261616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61616261 - 2² = 61616257 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 (61616231) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4401155 + ... + 4401168.

It is an arithmetic number, because the mean of its divisors is an integer number (17604648).

Almost surely, 2^61616261 is an apocalyptic number.

It is an amenable number.

61616261 is a deficient number, since it is larger than the sum of its proper divisors (8802331).

61616261 is an equidigital number, since it uses as much as digits as its factorization.

61616261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8802330.

The product of its digits is 2592, while the sum is 29.

The square root of 61616261 is about 7849.6026014060. The cubic root of 61616261 is about 394.9709127756.

Adding to 61616261 its reverse (16261616), we get a palindrome (77877877).

The spelling of 61616261 in words is "sixty-one million, six hundred sixteen thousand, two hundred sixty-one".