55516001 has 2 divisors, whose sum is σ = 55516002. Its totient is φ = 55516000.

The previous prime is 55515983. The next prime is 55516003. The reversal of 55516001 is 10061555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47541025 + 7974976 = 6895^2 + 2824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55516001 is a prime.

Together with 55516003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55516003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27758000 + 27758001.

It is an arithmetic number, because the mean of its divisors is an integer number (27758001).

Almost surely, 2^55516001 is an apocalyptic number.

It is an amenable number.

55516001 is a deficient number, since it is larger than the sum of its proper divisors (1).

55516001 is an equidigital number, since it uses as much as digits as its factorization.

55516001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 55516001 is about 7450.9060522865. The cubic root of 55516001 is about 381.4808353580.

Adding to 55516001 its reverse (10061555), we get a palindrome (65577556).

The spelling of 55516001 in words is "fifty-five million, five hundred sixteen thousand, one".