55877621 has 2 divisors, whose sum is σ = 55877622. Its totient is φ = 55877620.

The previous prime is 55877617. The next prime is 55877663. The reversal of 55877621 is 12677855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39564100 + 16313521 = 6290^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 55877621 - 2² = 55877617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55877611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27938810 + 27938811.

It is an arithmetic number, because the mean of its divisors is an integer number (27938811).

Almost surely, 2^55877621 is an apocalyptic number.

It is an amenable number.

55877621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55877621 is an equidigital number, since it uses as much as digits as its factorization.

55877621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 41.

The square root of 55877621 is about 7475.1335105134. The cubic root of 55877621 is about 382.3073397167.

The spelling of 55877621 in words is "fifty-five million, eight hundred seventy-seven thousand, six hundred twenty-one".