55133989 has 2 divisors, whose sum is σ = 55133990. Its totient is φ = 55133988.

The previous prime is 55133977. The next prime is 55133993. The reversal of 55133989 is 98933155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 3364 = 7425^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 55133989 - 2⁵ = 55133957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55133929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27566994 + 27566995.

It is an arithmetic number, because the mean of its divisors is an integer number (27566995).

Almost surely, 2^55133989 is an apocalyptic number.

It is an amenable number.

55133989 is a deficient number, since it is larger than the sum of its proper divisors (1).

55133989 is an equidigital number, since it uses as much as digits as its factorization.

55133989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 43.

The square root of 55133989 is about 7425.2265285310. The cubic root of 55133989 is about 380.6038161191.

The spelling of 55133989 in words is "fifty-five million, one hundred thirty-three thousand, nine hundred eighty-nine".