55631789 has 2 divisors, whose sum is σ = 55631790. Its totient is φ = 55631788.

The previous prime is 55631759. The next prime is 55631801. The reversal of 55631789 is 98713655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52852900 + 2778889 = 7270^2 + 1667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55631789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55631759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27815894 + 27815895.

It is an arithmetic number, because the mean of its divisors is an integer number (27815895).

Almost surely, 2^55631789 is an apocalyptic number.

It is an amenable number.

55631789 is a deficient number, since it is larger than the sum of its proper divisors (1).

55631789 is an equidigital number, since it uses as much as digits as its factorization.

55631789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 55631789 is about 7458.6720667958. The cubic root of 55631789 is about 381.7458654339.

The spelling of 55631789 in words is "fifty-five million, six hundred thirty-one thousand, seven hundred eighty-nine".