55381553 has 2 divisors, whose sum is σ = 55381554. Its totient is φ = 55381552.

The previous prime is 55381519. The next prime is 55381567. The reversal of 55381553 is 35518355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55011889 + 369664 = 7417^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 55381553 - 2⁸ = 55381297 is a prime.

It is not a weakly prime, because it can be changed into another prime (55381253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27690776 + 27690777.

It is an arithmetic number, because the mean of its divisors is an integer number (27690777).

Almost surely, 2^55381553 is an apocalyptic number.

It is an amenable number.

55381553 is a deficient number, since it is larger than the sum of its proper divisors (1).

55381553 is an equidigital number, since it uses as much as digits as its factorization.

55381553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45000, while the sum is 35.

The square root of 55381553 is about 7441.8783247242. The cubic root of 55381553 is about 381.1726311514.

The spelling of 55381553 in words is "fifty-five million, three hundred eighty-one thousand, five hundred fifty-three".