55220887 has 2 divisors, whose sum is σ = 55220888. Its totient is φ = 55220886.

The previous prime is 55220863. The next prime is 55220899. The reversal of 55220887 is 78802255.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55220887 is a prime.

It is a super-2 number, since 2×55220887² = 6098692722133538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55223887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27610443 + 27610444.

It is an arithmetic number, because the mean of its divisors is an integer number (27610444).

Almost surely, 2^55220887 is an apocalyptic number.

55220887 is a deficient number, since it is larger than the sum of its proper divisors (1).

55220887 is an equidigital number, since it uses as much as digits as its factorization.

55220887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 55220887 is about 7431.0757633064. The cubic root of 55220887 is about 380.8036707528.

The spelling of 55220887 in words is "fifty-five million, two hundred twenty thousand, eight hundred eighty-seven".