55616261 has 2 divisors, whose sum is σ = 55616262. Its totient is φ = 55616260.

The previous prime is 55616251. The next prime is 55616279. The reversal of 55616261 is 16261655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45819361 + 9796900 = 6769^2 + 3130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55616261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55616251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27808130 + 27808131.

It is an arithmetic number, because the mean of its divisors is an integer number (27808131).

Almost surely, 2^55616261 is an apocalyptic number.

It is an amenable number.

55616261 is a deficient number, since it is larger than the sum of its proper divisors (1).

55616261 is an equidigital number, since it uses as much as digits as its factorization.

55616261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 55616261 is about 7457.6310581846. The cubic root of 55616261 is about 381.7103443675.

The spelling of 55616261 in words is "fifty-five million, six hundred sixteen thousand, two hundred sixty-one".